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/rtc_base/task_utils/BUILD.gn b/rtc_base/task_utils/BUILD.gn
index 7a466a1..7eca496 100644
--- a/rtc_base/task_utils/BUILD.gn
+++ b/rtc_base/task_utils/BUILD.gn
@@ -32,7 +32,6 @@
   ]
   deps = [
     "../../api/task_queue",
-    "//third_party/abseil-cpp/absl/memory",
   ]
 }
 
@@ -48,7 +47,6 @@
       "..:rtc_task_queue",
       "..:task_queue_for_test",
       "../../test:test_support",
-      "//third_party/abseil-cpp/absl/memory",
     ]
   }
 
diff --git a/rtc_base/task_utils/repeating_task.cc b/rtc_base/task_utils/repeating_task.cc
index 1705918..aeeb7c0 100644
--- a/rtc_base/task_utils/repeating_task.cc
+++ b/rtc_base/task_utils/repeating_task.cc
@@ -10,6 +10,7 @@
 
 #include "rtc_base/task_utils/repeating_task.h"
 
+#include "absl/memory/memory.h"
 #include "rtc_base/logging.h"
 #include "rtc_base/task_utils/to_queued_task.h"
 #include "rtc_base/time_utils.h"
diff --git a/rtc_base/task_utils/repeating_task.h b/rtc_base/task_utils/repeating_task.h
index 8549049..1545d6f 100644
--- a/rtc_base/task_utils/repeating_task.h
+++ b/rtc_base/task_utils/repeating_task.h
@@ -11,10 +11,10 @@
 #ifndef RTC_BASE_TASK_UTILS_REPEATING_TASK_H_
 #define RTC_BASE_TASK_UTILS_REPEATING_TASK_H_
 
+#include <memory>
 #include <type_traits>
 #include <utility>
 
-#include "absl/memory/memory.h"
 #include "api/task_queue/queued_task.h"
 #include "api/task_queue/task_queue_base.h"
 #include "api/units/time_delta.h"
@@ -93,7 +93,7 @@
   template <class Closure>
   static RepeatingTaskHandle Start(TaskQueueBase* task_queue,
                                    Closure&& closure) {
-    auto repeating_task = absl::make_unique<
+    auto repeating_task = std::make_unique<
         webrtc_repeating_task_impl::RepeatingTaskImpl<Closure>>(
         task_queue, TimeDelta::Zero(), std::forward<Closure>(closure));
     auto* repeating_task_ptr = repeating_task.get();
@@ -107,7 +107,7 @@
   static RepeatingTaskHandle DelayedStart(TaskQueueBase* task_queue,
                                           TimeDelta first_delay,
                                           Closure&& closure) {
-    auto repeating_task = absl::make_unique<
+    auto repeating_task = std::make_unique<
         webrtc_repeating_task_impl::RepeatingTaskImpl<Closure>>(
         task_queue, first_delay, std::forward<Closure>(closure));
     auto* repeating_task_ptr = repeating_task.get();
diff --git a/rtc_base/task_utils/repeating_task_unittest.cc b/rtc_base/task_utils/repeating_task_unittest.cc
index 471914c..2532098 100644
--- a/rtc_base/task_utils/repeating_task_unittest.cc
+++ b/rtc_base/task_utils/repeating_task_unittest.cc
@@ -15,7 +15,6 @@
 #include <memory>
 #include <thread>  // Not allowed in production per Chromium style guide.
 
-#include "absl/memory/memory.h"
 #include "rtc_base/event.h"
 #include "rtc_base/task_queue_for_test.h"
 #include "test/gmock.h"
@@ -219,7 +218,7 @@
     }
   };
   TaskQueueForTest task_queue("queue");
-  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.Get());
diff --git a/rtc_base/task_utils/to_queued_task.h b/rtc_base/task_utils/to_queued_task.h
index 5088af9..ab5e2c9 100644
--- a/rtc_base/task_utils/to_queued_task.h
+++ b/rtc_base/task_utils/to_queued_task.h
@@ -15,7 +15,6 @@
 #include <type_traits>
 #include <utility>
 
-#include "absl/memory/memory.h"
 #include "api/task_queue/queued_task.h"
 
 namespace webrtc {
@@ -57,13 +56,13 @@
 // based parameters.
 template <typename Closure>
 std::unique_ptr<QueuedTask> ToQueuedTask(Closure&& closure) {
-  return absl::make_unique<webrtc_new_closure_impl::ClosureTask<Closure>>(
+  return std::make_unique<webrtc_new_closure_impl::ClosureTask<Closure>>(
       std::forward<Closure>(closure));
 }
 
 template <typename Closure, typename Cleanup>
 std::unique_ptr<QueuedTask> ToQueuedTask(Closure&& closure, Cleanup&& cleanup) {
-  return absl::make_unique<
+  return std::make_unique<
       webrtc_new_closure_impl::ClosureTaskWithCleanup<Closure, Cleanup>>(
       std::forward<Closure>(closure), std::forward<Cleanup>(cleanup));
 }