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/rtc_base/socket_unittest.cc b/rtc_base/socket_unittest.cc
index 01ef014..cbc5eb5 100644
--- a/rtc_base/socket_unittest.cc
+++ b/rtc_base/socket_unittest.cc
@@ -12,12 +12,12 @@
 
 #include "rtc_base/socket_unittest.h"
 
+#include "absl/memory/memory.h"
 #include "rtc_base/arraysize.h"
 #include "rtc_base/asyncudpsocket.h"
 #include "rtc_base/buffer.h"
 #include "rtc_base/gunit.h"
 #include "rtc_base/nethelpers.h"
-#include "rtc_base/ptr_util.h"
 #include "rtc_base/socketserver.h"
 #include "rtc_base/testclient.h"
 #include "rtc_base/testutils.h"
@@ -905,9 +905,9 @@
 
   // Test send/receive behavior.
   std::unique_ptr<TestClient> client1(
-      new TestClient(WrapUnique(AsyncUDPSocket::Create(ss_, addr1))));
+      new TestClient(absl::WrapUnique(AsyncUDPSocket::Create(ss_, addr1))));
   std::unique_ptr<TestClient> client2(
-      new TestClient(WrapUnique(AsyncUDPSocket::Create(ss_, empty))));
+      new TestClient(absl::WrapUnique(AsyncUDPSocket::Create(ss_, empty))));
 
   SocketAddress addr2;
   EXPECT_EQ(3, client2->SendTo("foo", 3, addr1));
@@ -920,7 +920,7 @@
   // TODO: figure out what the intent is here
   for (int i = 0; i < 10; ++i) {
     client2.reset(
-        new TestClient(WrapUnique(AsyncUDPSocket::Create(ss_, empty))));
+        new TestClient(absl::WrapUnique(AsyncUDPSocket::Create(ss_, empty))));
 
     SocketAddress addr4;
     EXPECT_EQ(3, client2->SendTo("foo", 3, addr1));
@@ -947,7 +947,7 @@
 
   // Test send
   std::unique_ptr<TestClient> client(
-      new TestClient(WrapUnique(AsyncUDPSocket::Create(ss_, empty))));
+      new TestClient(absl::WrapUnique(AsyncUDPSocket::Create(ss_, empty))));
   int test_packet_size = 1200;
   std::unique_ptr<char[]> test_packet(new char[test_packet_size]);
   // Init the test packet just to avoid memcheck warning.