Revert of Remove calls to MessageLoop::current() in content.

content/browser/device_sensors/data_fetcher_shared_memory_mac.cc

 // Copyright 2014 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 "content/browser/device_sensors/data_fetcher_shared_memory.h"
 
 #include <stdint.h>
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
-#include "base/single_thread_task_runner.h"
 #include "content/browser/device_sensors/ambient_light_mac.h"
 #include "third_party/sudden_motion_sensor/sudden_motion_sensor_mac.h"
 
 namespace {
 
 const double kMeanGravity = 9.80665;
 
 double LMUvalueToLux(uint64_t raw_value) {
   // Conversion formula from regression.
   // https://bugzilla.mozilla.org/show_bug.cgi?id=793728
@@ skipping 113 matching lines @@
 
 namespace content {
 
 DataFetcherSharedMemory::DataFetcherSharedMemory() {
 }
 
 DataFetcherSharedMemory::~DataFetcherSharedMemory() {
 }
 
 void DataFetcherSharedMemory::Fetch(unsigned consumer_bitmask) {
-  DCHECK(GetPollingMessageLoop()->task_runner()->BelongsToCurrentThread());
+  DCHECK(base::MessageLoop::current() == GetPollingMessageLoop());
   DCHECK(consumer_bitmask & CONSUMER_TYPE_ORIENTATION ||
          consumer_bitmask & CONSUMER_TYPE_MOTION ||
          consumer_bitmask & CONSUMER_TYPE_LIGHT);
 
   if (consumer_bitmask & CONSUMER_TYPE_ORIENTATION)
     FetchOrientation(sudden_motion_sensor_.get(), orientation_buffer_);
   if (consumer_bitmask & CONSUMER_TYPE_MOTION)
     FetchMotion(sudden_motion_sensor_.get(), motion_buffer_);
   if (consumer_bitmask & CONSUMER_TYPE_LIGHT)
     FetchLight(ambient_light_sensor_.get(), light_buffer_);
 }
 
 DataFetcherSharedMemory::FetcherType DataFetcherSharedMemory::GetType() const {
   return FETCHER_TYPE_POLLING_CALLBACK;
 }
 
 bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) {
-  DCHECK(GetPollingMessageLoop()->task_runner()->BelongsToCurrentThread());
+  DCHECK(base::MessageLoop::current() == GetPollingMessageLoop());
   DCHECK(buffer);
 
   switch (consumer_type) {
     case CONSUMER_TYPE_MOTION: {
       if (!sudden_motion_sensor_)
         sudden_motion_sensor_.reset(SuddenMotionSensor::Create());
       bool sudden_motion_sensor_available =
           sudden_motion_sensor_.get() != nullptr;
 
       motion_buffer_ = static_cast<DeviceMotionHardwareBuffer*>(buffer);
@@ skipping 55 matching lines @@
       }
       return ambient_light_sensor_available;
     }
     default:
       NOTREACHED();
   }
   return false;
 }
 
 bool DataFetcherSharedMemory::Stop(ConsumerType consumer_type) {
-  DCHECK(GetPollingMessageLoop()->task_runner()->BelongsToCurrentThread());
+  DCHECK(base::MessageLoop::current() == GetPollingMessageLoop());
 
   switch (consumer_type) {
     case CONSUMER_TYPE_MOTION:
       if (motion_buffer_) {
         motion_buffer_->seqlock.WriteBegin();
         motion_buffer_->data.allAvailableSensorsAreActive = false;
         motion_buffer_->seqlock.WriteEnd();
         motion_buffer_ = nullptr;
       }
       return true;
@@ skipping 21 matching lines @@
         light_buffer_ = nullptr;
       }
       return true;
     default:
       NOTREACHED();
   }
   return false;
 }
 
 }  // namespace content