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}

modules/audio_coding/neteq/neteq_decoder_plc_unittest.cc

@@ -11,10 +11,10 @@
 // Test to verify correct operation when using the decoder-internal PLC.
 
 #include <algorithm>
+#include <memory>
 #include <utility>
 #include <vector>
 
-#include "absl/memory/memory.h"
 #include "absl/types/optional.h"
 #include "modules/audio_coding/codecs/pcm16b/audio_encoder_pcm16b.h"
 #include "modules/audio_coding/neteq/tools/audio_checksum.h"
@@ -156,31 +156,31 @@ NetEqNetworkStatistics RunTest(int loss_cadence, std::string* checksum) {
   // The input is mostly useless. It sends zero-samples to a PCM16b encoder,
   // but the actual encoded samples will never be used by the decoder in the
   // test. See below about the decoder.
-  auto generator = absl::make_unique<ZeroSampleGenerator>();
+  auto generator = std::make_unique<ZeroSampleGenerator>();
   constexpr int kSampleRateHz = 32000;
   constexpr int kPayloadType = 100;
   AudioEncoderPcm16B::Config encoder_config;
   encoder_config.sample_rate_hz = kSampleRateHz;
   encoder_config.payload_type = kPayloadType;
-  auto encoder = absl::make_unique<AudioEncoderPcm16B>(encoder_config);
+  auto encoder = std::make_unique<AudioEncoderPcm16B>(encoder_config);
   constexpr int kRunTimeMs = 10000;
-  auto input = absl::make_unique<EncodeNetEqInput>(
+  auto input = std::make_unique<EncodeNetEqInput>(
       std::move(generator), std::move(encoder), kRunTimeMs);
   // Wrap the input in a loss function.
   auto lossy_input =
-      absl::make_unique<LossyInput>(loss_cadence, std::move(input));
+      std::make_unique<LossyInput>(loss_cadence, std::move(input));
 
   // Settinng up decoders.
   NetEqTest::DecoderMap decoders;
   // Using a fake decoder which simply reads the output audio from a file.
-  auto input_file = absl::make_unique<InputAudioFile>(
+  auto input_file = std::make_unique<InputAudioFile>(
       webrtc::test::ResourcePath("audio_coding/testfile32kHz", "pcm"));
   AudioDecoderPlc dec(std::move(input_file), kSampleRateHz);
   // Masquerading as a PCM16b decoder.
   decoders.emplace(kPayloadType, SdpAudioFormat("l16", 32000, 1));
 
   // Output is simply a checksum calculator.
-  auto output = absl::make_unique<AudioChecksumWithOutput>(checksum);
+  auto output = std::make_unique<AudioChecksumWithOutput>(checksum);
 
   // No callback objects.
   NetEqTest::Callbacks callbacks;