Replace MessageLoop::current()->task_runner() with ThreadTaskRunnerHandle::Get().

services/tracing/public/cpp/provider.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "services/tracing/public/cpp/provider.h"
 
 #include <utility>
 
 #include "base/callback.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/platform_thread.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "base/trace_event/trace_config.h"
 #include "base/trace_event/trace_event.h"
 #include "services/shell/public/cpp/connection.h"
 #include "services/shell/public/cpp/connector.h"
 #include "services/tracing/public/cpp/switches.h"
 
 namespace tracing {
 namespace {
 
@@ skipping 74 matching lines @@
     base::trace_event::TraceLog::GetInstance()->Flush(
         base::Bind(&Provider::SendChunk, base::Unretained(this)));
   }
 }
 
 void Provider::ForceEnableTracing() {
   base::trace_event::TraceLog::GetInstance()->SetEnabled(
       base::trace_event::TraceConfig("*", base::trace_event::RECORD_UNTIL_FULL),
       base::trace_event::TraceLog::RECORDING_MODE);
   tracing_forced_ = true;
-  base::MessageLoop::current()->task_runner()->PostTask(
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,
       base::Bind(&Provider::DelayedStop, weak_factory_.GetWeakPtr()));
 }
 
 void Provider::DelayedStop() {
   // We use this indirection to account for cases where the Initialize method
   // takes more than one second to finish; thus we start the countdown only when
   // the current thread is unblocked.
-  base::MessageLoop::current()->task_runner()->PostDelayedTask(
+  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE,
       base::Bind(&Provider::StopIfForced, weak_factory_.GetWeakPtr()),
       base::TimeDelta::FromSeconds(1));
 }
 
 void Provider::StopIfForced() {
   if (!tracing_forced_) {
     return;
   }
   base::trace_event::TraceLog::GetInstance()->SetDisabled();
@@ skipping 10 matching lines @@
   // events. Empty string is not a valid chunk to record so skip in this case.
   if (!events_str->data().empty()) {
     recorder_->Record(mojo::String(events_str->data()));
   }
   if (!has_more_events) {
     recorder_.reset();
   }
 }
 
 }  // namespace tracing