Remove unused critical section includes.

Bug: webrtc:11567
Change-Id: Ic5e43c51ce06c0619adc265d12ad4bef73a9df76
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/179521
Reviewed-by: Tommi <tommi@webrtc.org>
Commit-Queue: Markus Handell <handellm@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31745}
diff --git a/rtc_base/async_invoker_inl.h b/rtc_base/async_invoker_inl.h
index bd9b0d1..6307afe 100644
--- a/rtc_base/async_invoker_inl.h
+++ b/rtc_base/async_invoker_inl.h
@@ -13,7 +13,6 @@
 
 #include "api/scoped_refptr.h"
 #include "rtc_base/bind.h"
-#include "rtc_base/critical_section.h"
 #include "rtc_base/event.h"
 #include "rtc_base/message_handler.h"
 #include "rtc_base/ref_counted_object.h"
diff --git a/rtc_base/logging.cc b/rtc_base/logging.cc
index 94ddcba..d07a7e7 100644
--- a/rtc_base/logging.cc
+++ b/rtc_base/logging.cc
@@ -42,7 +42,6 @@
 
 #include "absl/base/attributes.h"
 #include "rtc_base/checks.h"
-#include "rtc_base/critical_section.h"
 #include "rtc_base/platform_thread_types.h"
 #include "rtc_base/string_encode.h"
 #include "rtc_base/string_utils.h"
diff --git a/rtc_base/stream.h b/rtc_base/stream.h
index bfb9dc2..dc77a71 100644
--- a/rtc_base/stream.h
+++ b/rtc_base/stream.h
@@ -15,7 +15,6 @@
 
 #include "rtc_base/buffer.h"
 #include "rtc_base/constructor_magic.h"
-#include "rtc_base/critical_section.h"
 #include "rtc_base/message_handler.h"
 #include "rtc_base/system/rtc_export.h"
 #include "rtc_base/third_party/sigslot/sigslot.h"
diff --git a/rtc_base/system/file_wrapper.h b/rtc_base/system/file_wrapper.h
index 24c333a..42c463c 100644
--- a/rtc_base/system/file_wrapper.h
+++ b/rtc_base/system/file_wrapper.h
@@ -14,7 +14,7 @@
 #include <stddef.h>
 #include <stdio.h>
 
-#include "rtc_base/critical_section.h"
+#include <string>
 
 // Implementation that can read (exclusive) or write from/to a file.