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/call/rampup_tests.cc b/call/rampup_tests.cc
index b3f2063..841f4d6 100644
--- a/call/rampup_tests.cc
+++ b/call/rampup_tests.cc
@@ -13,7 +13,6 @@
 #include <memory>
 
 #include "absl/flags/flag.h"
-#include "absl/memory/memory.h"
 #include "api/rtc_event_log/rtc_event_log_factory.h"
 #include "api/rtc_event_log_output_file.h"
 #include "api/task_queue/default_task_queue_factory.h"
@@ -120,13 +119,13 @@
 test::PacketTransport* RampUpTester::CreateSendTransport(
     test::DEPRECATED_SingleThreadedTaskQueueForTesting* task_queue,
     Call* sender_call) {
-  auto network = absl::make_unique<SimulatedNetwork>(forward_transport_config_);
+  auto network = std::make_unique<SimulatedNetwork>(forward_transport_config_);
   send_simulated_network_ = network.get();
   send_transport_ = new test::PacketTransport(
       task_queue, sender_call, this, test::PacketTransport::kSender,
       test::CallTest::payload_type_map_,
-      absl::make_unique<FakeNetworkPipe>(Clock::GetRealTimeClock(),
-                                         std::move(network)));
+      std::make_unique<FakeNetworkPipe>(Clock::GetRealTimeClock(),
+                                        std::move(network)));
   return send_transport_;
 }
 
@@ -641,11 +640,11 @@
           RtcEventLog::EncodingType::Legacy);
       bool event_log_started =
           send_event_log_->StartLogging(
-              absl::make_unique<RtcEventLogOutputFile>(
+              std::make_unique<RtcEventLogOutputFile>(
                   dump_name + ".send.rtc.dat", RtcEventLog::kUnlimitedOutput),
               RtcEventLog::kImmediateOutput) &&
           recv_event_log_->StartLogging(
-              absl::make_unique<RtcEventLogOutputFile>(
+              std::make_unique<RtcEventLogOutputFile>(
                   dump_name + ".recv.rtc.dat", RtcEventLog::kUnlimitedOutput),
               RtcEventLog::kImmediateOutput);
       RTC_DCHECK(event_log_started);