Use std::make_unique instead of absl::make_unique.

WebRTC is now using C++14 so there is no need to use the Abseil version
of std::make_unique.

This CL has been created with the following steps:

git grep -l absl::make_unique | sort | uniq > /tmp/make_unique.txt
git grep -l absl::WrapUnique | sort | uniq > /tmp/wrap_unique.txt
git grep -l "#include <memory>" | sort | uniq > /tmp/memory.txt

diff --new-line-format="" --unchanged-line-format="" \
  /tmp/make_unique.txt /tmp/wrap_unique.txt | sort | \
  uniq > /tmp/only_make_unique.txt
diff --new-line-format="" --unchanged-line-format="" \
  /tmp/only_make_unique.txt /tmp/memory.txt | \
  xargs grep -l "absl/memory" > /tmp/add-memory.txt

git grep -l "\babsl::make_unique\b" | \
  xargs sed -i "s/\babsl::make_unique\b/std::make_unique/g"

git checkout PRESUBMIT.py abseil-in-webrtc.md

cat /tmp/add-memory.txt | \
  xargs sed -i \
  's/#include "absl\/memory\/memory.h"/#include <memory>/g'
git cl format
# Manual fix order of the new inserted #include <memory>

cat /tmp/only_make_unique | xargs grep -l "#include <memory>" | \
  xargs sed -i '/#include "absl\/memory\/memory.h"/d'

git ls-files | grep BUILD.gn | \
  xargs sed -i '/\/\/third_party\/abseil-cpp\/absl\/memory/d'

python tools_webrtc/gn_check_autofix.py \
  -m tryserver.webrtc -b linux_rel

# Repead the gn_check_autofix step for other platforms

git ls-files | grep BUILD.gn | \
  xargs sed -i 's/absl\/memory:memory/absl\/memory/g'
git cl format

Bug: webrtc:10945
Change-Id: I3fe28ea80f4dd3ba3cf28effd151d5e1f19aff89
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/153221
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Alessio Bazzica <alessiob@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29209}
diff --git a/examples/androidnativeapi/BUILD.gn b/examples/androidnativeapi/BUILD.gn
index 1d452ee..dad0840 100644
--- a/examples/androidnativeapi/BUILD.gn
+++ b/examples/androidnativeapi/BUILD.gn
@@ -62,7 +62,6 @@
       "//sdk/android:native_api_base",
       "//sdk/android:native_api_jni",
       "//sdk/android:native_api_video",
-      "//third_party/abseil-cpp/absl/memory",
     ]
   }
 
diff --git a/examples/androidnativeapi/jni/android_call_client.cc b/examples/androidnativeapi/jni/android_call_client.cc
index 7bd6d3b..0396833 100644
--- a/examples/androidnativeapi/jni/android_call_client.cc
+++ b/examples/androidnativeapi/jni/android_call_client.cc
@@ -12,7 +12,8 @@
 
 #include <utility>
 
-#include "absl/memory/memory.h"
+#include <memory>
+
 #include "api/peer_connection_interface.h"
 #include "api/rtc_event_log/rtc_event_log_factory.h"
 #include "api/task_queue/default_task_queue_factory.h"
@@ -75,7 +76,7 @@
 }  // namespace
 
 AndroidCallClient::AndroidCallClient()
-    : call_started_(false), pc_observer_(absl::make_unique<PCObserver>(this)) {
+    : call_started_(false), pc_observer_(std::make_unique<PCObserver>(this)) {
   thread_checker_.Detach();
   CreatePeerConnectionFactory();
 }
@@ -155,15 +156,15 @@
   pcf_deps.signaling_thread = signaling_thread_.get();
   pcf_deps.task_queue_factory = webrtc::CreateDefaultTaskQueueFactory();
   pcf_deps.call_factory = webrtc::CreateCallFactory();
-  pcf_deps.event_log_factory = absl::make_unique<webrtc::RtcEventLogFactory>(
+  pcf_deps.event_log_factory = std::make_unique<webrtc::RtcEventLogFactory>(
       pcf_deps.task_queue_factory.get());
 
   cricket::MediaEngineDependencies media_deps;
   media_deps.task_queue_factory = pcf_deps.task_queue_factory.get();
   media_deps.video_encoder_factory =
-      absl::make_unique<webrtc::InternalEncoderFactory>();
+      std::make_unique<webrtc::InternalEncoderFactory>();
   media_deps.video_decoder_factory =
-      absl::make_unique<webrtc::InternalDecoderFactory>();
+      std::make_unique<webrtc::InternalDecoderFactory>();
   webrtc::SetMediaEngineDefaults(&media_deps);
   pcf_deps.media_engine = cricket::CreateMediaEngine(std::move(media_deps));
   RTC_LOG(LS_INFO) << "Media engine created: " << pcf_deps.media_engine.get();