Reland "[cleanup] Remove useless includes."

Reason for reland: Downstream project fixed.

Original change's description:

> [cleanup] Remove useless includes.
>
> Manual cleanup guided by include-what-you-use diagnostic.
>
> Bug: webrtc:8311
> Change-Id: I00be03392cc7ee005101427ea7dc701621ccea68
> Reviewed-on: https://webrtc-review.googlesource.com/c/103320
> Commit-Queue: Yves Gerey <yvesg@webrtc.org>
> Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#25013}

Bug: webrtc:8311
Change-Id: Id6ec4aeb798886a90ace640a190eaf16497ba31b
Reviewed-on: https://webrtc-review.googlesource.com/c/104120
Commit-Queue: Yves Gerey <yvesg@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25034}
diff --git a/api/audio_codecs/audio_encoder.h b/api/audio_codecs/audio_encoder.h
index 6a1f653..562b42d 100644
--- a/api/audio_codecs/audio_encoder.h
+++ b/api/audio_codecs/audio_encoder.h
@@ -11,7 +11,6 @@
 #ifndef API_AUDIO_CODECS_AUDIO_ENCODER_H_
 #define API_AUDIO_CODECS_AUDIO_ENCODER_H_
 
-#include <algorithm>
 #include <memory>
 #include <string>
 #include <vector>
diff --git a/api/audio_codecs/audio_format.h b/api/audio_codecs/audio_format.h
index aa5dbb1..8d28b4f 100644
--- a/api/audio_codecs/audio_format.h
+++ b/api/audio_codecs/audio_format.h
@@ -13,10 +13,10 @@
 
 #include <map>
 #include <string>
+// TODO(yvesg) Fix presubmit check and/or remove unused swap function.
 #include <utility>
 
 #include "absl/strings/string_view.h"
-#include "absl/types/optional.h"
 #include "rtc_base/checks.h"
 
 namespace webrtc {
diff --git a/api/candidate.cc b/api/candidate.cc
index c2c6c53..10751ae 100644
--- a/api/candidate.cc
+++ b/api/candidate.cc
@@ -10,6 +10,7 @@
 
 #include "api/candidate.h"
 
+#include "rtc_base/helpers.h"
 #include "rtc_base/strings/string_builder.h"
 
 namespace cricket {
diff --git a/api/candidate.h b/api/candidate.h
index 6e0547b..0a84591 100644
--- a/api/candidate.h
+++ b/api/candidate.h
@@ -18,7 +18,6 @@
 #include <string>
 
 #include "rtc_base/checks.h"
-#include "rtc_base/helpers.h"
 #include "rtc_base/network_constants.h"
 #include "rtc_base/socketaddress.h"
 
diff --git a/api/jsepicecandidate.h b/api/jsepicecandidate.h
index 50520fe..a57f861 100644
--- a/api/jsepicecandidate.h
+++ b/api/jsepicecandidate.h
@@ -15,7 +15,6 @@
 #define API_JSEPICECANDIDATE_H_
 
 #include <string>
-#include <utility>
 #include <vector>
 
 #include "api/candidate.h"
diff --git a/api/mediaconstraintsinterface.h b/api/mediaconstraintsinterface.h
index c6a914a..560fa4a 100644
--- a/api/mediaconstraintsinterface.h
+++ b/api/mediaconstraintsinterface.h
@@ -24,7 +24,6 @@
 #include <string>
 #include <vector>
 
-#include "absl/types/optional.h"
 #include "api/peerconnectioninterface.h"
 
 namespace webrtc {
diff --git a/api/mediastreaminterface.h b/api/mediastreaminterface.h
index b661351..2eb2f31 100644
--- a/api/mediastreaminterface.h
+++ b/api/mediastreaminterface.h
@@ -24,17 +24,11 @@
 
 #include "absl/types/optional.h"
 #include "api/video/video_frame.h"
-// TODO(zhihuang): Remove unrelated headers once downstream applications stop
-// relying on them; they were previously transitively included by
-// mediachannel.h, which is no longer a dependency of this file.
 #include "api/video/video_sink_interface.h"
 #include "api/video/video_source_interface.h"
 #include "modules/audio_processing/include/audio_processing_statistics.h"
-#include "rtc_base/ratetracker.h"
 #include "rtc_base/refcount.h"
 #include "rtc_base/scoped_ref_ptr.h"
-#include "rtc_base/thread.h"
-#include "rtc_base/timeutils.h"
 
 namespace webrtc {
 
diff --git a/api/peerconnectioninterface.h b/api/peerconnectioninterface.h
index 1c32b69..c6850e1 100644
--- a/api/peerconnectioninterface.h
+++ b/api/peerconnectioninterface.h
@@ -69,7 +69,6 @@
 
 #include <memory>
 #include <string>
-#include <utility>
 #include <vector>
 
 #include "api/asyncresolverfactory.h"
@@ -79,7 +78,6 @@
 #include "api/audio_options.h"
 #include "api/call/callfactoryinterface.h"
 #include "api/datachannelinterface.h"
-#include "api/dtmfsenderinterface.h"
 #include "api/fec_controller.h"
 #include "api/jsep.h"
 #include "api/mediastreaminterface.h"
@@ -94,7 +92,6 @@
 #include "api/transport/bitrate_settings.h"
 #include "api/transport/network_control.h"
 #include "api/turncustomizer.h"
-#include "api/umametrics.h"
 #include "logging/rtc_event_log/rtc_event_log_factory_interface.h"
 #include "media/base/mediaconfig.h"
 // TODO(bugs.webrtc.org/6353): cricket::VideoCapturer is deprecated and should
diff --git a/api/rtp_headers.cc b/api/rtp_headers.cc
index da7f1ea..bf973b6 100644
--- a/api/rtp_headers.cc
+++ b/api/rtp_headers.cc
@@ -10,14 +10,6 @@
 
 #include "api/rtp_headers.h"
 
-#include <string.h>
-#include <algorithm>
-#include <limits>
-#include <type_traits>
-
-#include "rtc_base/checks.h"
-#include "rtc_base/stringutils.h"
-
 namespace webrtc {
 
 RTPHeaderExtension::RTPHeaderExtension()
diff --git a/api/rtp_headers.h b/api/rtp_headers.h
index 41f3988..799058d 100644
--- a/api/rtp_headers.h
+++ b/api/rtp_headers.h
@@ -13,10 +13,7 @@
 
 #include <stddef.h>
 #include <string.h>
-#include <string>
-#include <vector>
 
-#include "absl/types/optional.h"
 #include "api/array_view.h"
 #include "api/video/video_content_type.h"
 #include "api/video/video_frame_marking.h"
@@ -24,8 +21,6 @@
 #include "api/video/video_timing.h"
 
 #include "common_types.h"  // NOLINT(build/include)
-#include "rtc_base/checks.h"
-#include "rtc_base/deprecation.h"
 
 namespace webrtc {
 
diff --git a/api/rtpparameters.cc b/api/rtpparameters.cc
index 98ced9b..e9f4d5d 100644
--- a/api/rtpparameters.cc
+++ b/api/rtpparameters.cc
@@ -12,7 +12,6 @@
 #include <algorithm>
 #include <string>
 
-#include "rtc_base/checks.h"
 #include "rtc_base/strings/string_builder.h"
 
 namespace webrtc {
diff --git a/api/rtpsenderinterface.h b/api/rtpsenderinterface.h
index 9554c1c..7c94c21 100644
--- a/api/rtpsenderinterface.h
+++ b/api/rtpsenderinterface.h
@@ -24,7 +24,6 @@
 #include "api/proxy.h"
 #include "api/rtcerror.h"
 #include "api/rtpparameters.h"
-#include "rtc_base/deprecation.h"
 #include "rtc_base/refcount.h"
 #include "rtc_base/scoped_ref_ptr.h"
 
diff --git a/api/video/video_bitrate_allocation.cc b/api/video/video_bitrate_allocation.cc
index 6c5ad1e..8922536 100644
--- a/api/video/video_bitrate_allocation.cc
+++ b/api/video/video_bitrate_allocation.cc
@@ -10,12 +10,9 @@
 
 #include "api/video/video_bitrate_allocation.h"
 
-#include <limits>
-
 #include "rtc_base/checks.h"
 #include "rtc_base/numerics/safe_conversions.h"
 #include "rtc_base/strings/string_builder.h"
-#include "rtc_base/stringutils.h"
 
 namespace webrtc {
 
diff --git a/api/video/video_content_type.h b/api/video/video_content_type.h
index 8c64602..2d38a62 100644
--- a/api/video/video_content_type.h
+++ b/api/video/video_content_type.h
@@ -13,8 +13,6 @@
 
 #include <stdint.h>
 
-#include <string>
-
 namespace webrtc {
 
 enum class VideoContentType : uint8_t {