Use absl::make_unique and absl::WrapUnique directly

Instead of going through our wrappers in ptr_util.h.

This CL was generated by the following script:

  git grep -l ptr_util | xargs perl -pi -e 's,#include "rtc_base/ptr_util.h",#include "absl/memory/memory.h",'
  git grep -l MakeUnique | xargs perl -pi -e 's,\b(rtc::)?MakeUnique\b,absl::make_unique,g'
  git grep -l WrapUnique | xargs perl -pi -e 's,\b(rtc::)?WrapUnique\b,absl::WrapUnique,g'
  git checkout -- rtc_base/ptr_util{.h,_unittest.cc}
  git cl format

Followed by manually adding dependencies on
//third_party/abseil-cpp/absl/memory until `gn check` stopped
complaining.

Bug: webrtc:9473
Change-Id: I89ccd363f070479b8c431eb2c3d404a46eaacc1c
Reviewed-on: https://webrtc-review.googlesource.com/86600
Commit-Queue: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23850}

modules/audio_processing/test/audio_processing_simulator.cc

@@ -18,6 +18,7 @@
 #include <utility>
 #include <vector>
 
+#include "absl/memory/memory.h"
 #include "api/audio/echo_canceller3_factory.h"
 #include "common_audio/include/audio_util.h"
 #include "modules/audio_processing/aec_dump/aec_dump_factory.h"
@@ -26,7 +27,6 @@
 #include "rtc_base/checks.h"
 #include "rtc_base/json.h"
 #include "rtc_base/logging.h"
-#include "rtc_base/ptr_util.h"
 #include "rtc_base/stringutils.h"
 
 namespace webrtc {
@@ -355,7 +355,7 @@ AudioProcessingSimulator::AudioProcessingSimulator(
     std::unique_ptr<AudioProcessingBuilder> ap_builder)
     : settings_(settings),
       ap_builder_(ap_builder ? std::move(ap_builder)
-                             : rtc::MakeUnique<AudioProcessingBuilder>()),
+                             : absl::make_unique<AudioProcessingBuilder>()),
       analog_mic_level_(settings.initial_mic_level),
       fake_recording_device_(
           settings.initial_mic_level,