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/test/time_controller/BUILD.gn b/test/time_controller/BUILD.gn
index 252dca9..aa12477 100644
--- a/test/time_controller/BUILD.gn
+++ b/test/time_controller/BUILD.gn
@@ -33,7 +33,6 @@
       "../../rtc_base/synchronization:yield_policy",
       "../../rtc_base/task_utils:to_queued_task",
       "../../system_wrappers",
-      "//third_party/abseil-cpp/absl/memory",
       "//third_party/abseil-cpp/absl/strings",
     ]
   }
@@ -48,7 +47,6 @@
       "../../rtc_base:rtc_base_approved",
       "../../rtc_base:rtc_task_queue",
       "../../rtc_base/task_utils:repeating_task",
-      "//third_party/abseil-cpp/absl/memory",
     ]
   }
 }
diff --git a/test/time_controller/simulated_time_controller.cc b/test/time_controller/simulated_time_controller.cc
index 5e163cb..05f86b4 100644
--- a/test/time_controller/simulated_time_controller.cc
+++ b/test/time_controller/simulated_time_controller.cc
@@ -13,11 +13,11 @@
 #include <deque>
 #include <list>
 #include <map>
+#include <memory>
 #include <string>
 #include <thread>
 #include <vector>
 
-#include "absl/memory/memory.h"
 #include "absl/strings/string_view.h"
 
 namespace webrtc {
@@ -307,7 +307,7 @@
     const char* thread_name) {
   rtc::CritScope lock(&lock_);
   auto process_thread =
-      absl::make_unique<SimulatedSequenceRunner>(this, thread_name);
+      std::make_unique<SimulatedSequenceRunner>(this, thread_name);
   runners_.push_back(process_thread.get());
   return process_thread;
 }
diff --git a/test/time_controller/simulated_time_controller_unittest.cc b/test/time_controller/simulated_time_controller_unittest.cc
index 15155c1..7ff4288 100644
--- a/test/time_controller/simulated_time_controller_unittest.cc
+++ b/test/time_controller/simulated_time_controller_unittest.cc
@@ -13,7 +13,6 @@
 #include <atomic>
 #include <memory>
 
-#include "absl/memory/memory.h"
 #include "rtc_base/task_queue.h"
 #include "rtc_base/task_utils/repeating_task.h"
 #include "test/gmock.h"
@@ -104,7 +103,7 @@
   rtc::TaskQueue task_queue(
       time_simulation.GetTaskQueueFactory()->CreateTaskQueue(
           "TestQueue", TaskQueueFactory::Priority::NORMAL));
-  auto object = absl::make_unique<ObjectOnTaskQueue>();
+  auto object = std::make_unique<ObjectOnTaskQueue>();
   // Create and start the periodic task.
   RepeatingTaskHandle handle;
   object->StartPeriodicTask(&handle, &task_queue);