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}
diff --git a/modules/audio_processing/BUILD.gn b/modules/audio_processing/BUILD.gn
index bbe9980..5c90a0c 100644
--- a/modules/audio_processing/BUILD.gn
+++ b/modules/audio_processing/BUILD.gn
@@ -214,6 +214,7 @@
     "../../common_audio:common_audio",
     "../../rtc_base:rtc_base_approved",
     "../../system_wrappers:system_wrappers",
+    "//third_party/abseil-cpp/absl/memory",
   ]
 }
 
@@ -522,6 +523,7 @@
       "test/conversational_speech:unittest",
       "vad:vad_unittests",
       "//testing/gtest",
+      "//third_party/abseil-cpp/absl/memory",
       "//third_party/abseil-cpp/absl/types:optional",
     ]
 
@@ -642,6 +644,7 @@
       "../../rtc_base:checks",
       "../../rtc_base:rtc_base_approved",
       "../../rtc_base:safe_minmax",
+      "//third_party/abseil-cpp/absl/memory",
       "//third_party/abseil-cpp/absl/types:optional",
     ]
   }
@@ -680,6 +683,7 @@
         "aec_dump",
         "aec_dump:aec_dump_impl",
         "//testing/gtest",
+        "//third_party/abseil-cpp/absl/memory",
         "//third_party/abseil-cpp/absl/types:optional",
       ]
     }  # audioproc_f_impl
@@ -692,6 +696,7 @@
         ":audio_processing",
         "../../api:audioproc_f_api",
         "../../rtc_base:rtc_base_approved",
+        "//third_party/abseil-cpp/absl/memory",
       ]
     }  # audioproc_f
   }