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/pc/peer_connection_bundle_unittest.cc b/pc/peer_connection_bundle_unittest.cc
index 7780ac6..543c9be 100644
--- a/pc/peer_connection_bundle_unittest.cc
+++ b/pc/peer_connection_bundle_unittest.cc
@@ -8,6 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#include <memory>
+
 #include "api/audio_codecs/builtin_audio_decoder_factory.h"
 #include "api/audio_codecs/builtin_audio_encoder_factory.h"
 #include "api/create_peerconnection_factory.h"
@@ -24,7 +26,6 @@
 #ifdef WEBRTC_ANDROID
 #include "pc/test/android_test_initializer.h"
 #endif
-#include "absl/memory/memory.h"
 #include "pc/test/fake_audio_capture_module.h"
 #include "rtc_base/fake_network.h"
 #include "rtc_base/gunit.h"
@@ -185,11 +186,11 @@
   WrapperPtr CreatePeerConnection(const RTCConfiguration& config) {
     auto* fake_network = NewFakeNetwork();
     auto port_allocator =
-        absl::make_unique<cricket::BasicPortAllocator>(fake_network);
+        std::make_unique<cricket::BasicPortAllocator>(fake_network);
     port_allocator->set_flags(cricket::PORTALLOCATOR_DISABLE_TCP |
                               cricket::PORTALLOCATOR_DISABLE_RELAY);
     port_allocator->set_step_delay(cricket::kMinimumStepDelay);
-    auto observer = absl::make_unique<MockPeerConnectionObserver>();
+    auto observer = std::make_unique<MockPeerConnectionObserver>();
     RTCConfiguration modified_config = config;
     modified_config.sdp_semantics = sdp_semantics_;
     auto pc = pc_factory_->CreatePeerConnection(
@@ -198,7 +199,7 @@
       return nullptr;
     }
 
-    auto wrapper = absl::make_unique<PeerConnectionWrapperForBundleTest>(
+    auto wrapper = std::make_unique<PeerConnectionWrapperForBundleTest>(
         pc_factory_, pc, std::move(observer));
     wrapper->set_network(fake_network);
     return wrapper;