[MessageLoop]: Replace MessageLoopCurrent::task_runner() in /ipc.

MessageLoopCurrent::task_runner() is depecated.
This CL replaces it with with ThreadTaskRunnerHandle::Get().
A small step towards deleting MessageLoop.

This CL was generated with git cl split.
Refer to the top-level CL if necessary :
https://chromium-review.googlesource.com/c/chromium/src/+/1631693

Please CQ if LGTY!

This CL was uploaded by git cl split.

R=jam@chromium.org

Bug: 616447
Change-Id: Ib72f68278cfd05901c1a69c612feb5415485dae8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636059
Auto-Submit: Etienne Pierre-Doray <etiennep@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665866}

ipc/ipc_mojo_perftest.cc

@@ -8,13 +8,13 @@
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
-#include "base/message_loop/message_loop_current.h"
 #include "base/process/process_metrics.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/test/perf_time_logger.h"
 #include "base/threading/thread.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "ipc/ipc_channel_mojo.h"
 #include "ipc/ipc_perftest_messages.h"
@@ -794,7 +794,7 @@ class CallbackPerfTest : public testing::Test {
     std::vector<PingPongTestParams> params = GetDefaultTestParams();
     for (size_t i = 0; i < params.size(); i++) {
       std::string hello("hello");
-      base::MessageLoopCurrent::Get()->task_runner()->PostTask(
+      base::ThreadTaskRunnerHandle::Get()->PostTask(
           FROM_HERE, base::BindOnce(&CallbackPerfTest::SingleThreadPingPostTask,
                                     base::Unretained(this), hello));
       message_count_ = count_down_ = params[i].message_count();
@@ -805,7 +805,7 @@ class CallbackPerfTest : public testing::Test {
   }
 
   void SingleThreadPingPostTask(const std::string& value) {
-    base::MessageLoopCurrent::Get()->task_runner()->PostTask(
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::BindOnce(&CallbackPerfTest::SingleThreadPongPostTask,
                                   base::Unretained(this), value));
   }
@@ -829,7 +829,7 @@ class CallbackPerfTest : public testing::Test {
       }
     }
 
-    base::MessageLoopCurrent::Get()->task_runner()->PostTask(
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::BindOnce(&CallbackPerfTest::SingleThreadPingPostTask,
                                   base::Unretained(this), payload_));
   }