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/channel_unittest.cc b/pc/channel_unittest.cc
index 5b388ea..efc1d59 100644
--- a/pc/channel_unittest.cc
+++ b/pc/channel_unittest.cc
@@ -14,7 +14,6 @@
 #include <memory>
 #include <utility>
 
-#include "absl/memory/memory.h"
 #include "api/array_view.h"
 #include "api/audio_options.h"
 #include "api/rtp_parameters.h"
@@ -132,9 +131,9 @@
   }
 
   void CreateChannels(int flags1, int flags2) {
-    CreateChannels(absl::make_unique<typename T::MediaChannel>(
+    CreateChannels(std::make_unique<typename T::MediaChannel>(
                        nullptr, typename T::Options()),
-                   absl::make_unique<typename T::MediaChannel>(
+                   std::make_unique<typename T::MediaChannel>(
                        nullptr, typename T::Options()),
                    flags1, flags2);
   }
@@ -262,7 +261,7 @@
       webrtc::RtpTransportInternal* rtp_transport,
       int flags) {
     rtc::Thread* signaling_thread = rtc::Thread::Current();
-    auto channel = absl::make_unique<typename T::Channel>(
+    auto channel = std::make_unique<typename T::Channel>(
         worker_thread, network_thread, signaling_thread, std::move(ch),
         cricket::CN_AUDIO, (flags & DTLS) != 0, webrtc::CryptoOptions(),
         &ssrc_generator_);
@@ -297,7 +296,7 @@
   std::unique_ptr<webrtc::RtpTransport> CreateUnencryptedTransport(
       rtc::PacketTransportInternal* rtp_packet_transport,
       rtc::PacketTransportInternal* rtcp_packet_transport) {
-    auto rtp_transport = absl::make_unique<webrtc::RtpTransport>(
+    auto rtp_transport = std::make_unique<webrtc::RtpTransport>(
         rtcp_packet_transport == nullptr);
 
     rtp_transport->SetRtpPacketTransport(rtp_packet_transport);
@@ -310,7 +309,7 @@
   std::unique_ptr<webrtc::DtlsSrtpTransport> CreateDtlsSrtpTransport(
       cricket::DtlsTransportInternal* rtp_dtls_transport,
       cricket::DtlsTransportInternal* rtcp_dtls_transport) {
-    auto dtls_srtp_transport = absl::make_unique<webrtc::DtlsSrtpTransport>(
+    auto dtls_srtp_transport = std::make_unique<webrtc::DtlsSrtpTransport>(
         rtcp_dtls_transport == nullptr);
 
     dtls_srtp_transport->SetDtlsTransports(rtp_dtls_transport,
@@ -959,8 +958,8 @@
         T::MediaChannel::SendRtcp(kRtcpReport, sizeof(kRtcpReport));
       }
     };
-    CreateChannels(absl::make_unique<LastWordMediaChannel>(),
-                   absl::make_unique<LastWordMediaChannel>(), RTCP_MUX,
+    CreateChannels(std::make_unique<LastWordMediaChannel>(),
+                   std::make_unique<LastWordMediaChannel>(), RTCP_MUX,
                    RTCP_MUX);
     EXPECT_TRUE(SendInitiate());
     EXPECT_TRUE(SendAccept());
@@ -1621,7 +1620,7 @@
     webrtc::RtpTransportInternal* rtp_transport,
     int flags) {
   rtc::Thread* signaling_thread = rtc::Thread::Current();
-  auto channel = absl::make_unique<cricket::VideoChannel>(
+  auto channel = std::make_unique<cricket::VideoChannel>(
       worker_thread, network_thread, signaling_thread, std::move(ch),
       cricket::CN_VIDEO, (flags & DTLS) != 0, webrtc::CryptoOptions(),
       &ssrc_generator_);
@@ -2440,7 +2439,7 @@
     webrtc::RtpTransportInternal* rtp_transport,
     int flags) {
   rtc::Thread* signaling_thread = rtc::Thread::Current();
-  auto channel = absl::make_unique<cricket::RtpDataChannel>(
+  auto channel = std::make_unique<cricket::RtpDataChannel>(
       worker_thread, network_thread, signaling_thread, std::move(ch),
       cricket::CN_DATA, (flags & DTLS) != 0, webrtc::CryptoOptions(),
       &ssrc_generator_);