Cleanup unused class/includes device(motion|orientation)

content/browser/device_sensors/device_inertial_sensor_service.h

 // 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.
 
 #ifndef CONTENT_BROWSER_DEVICE_SENSORS_DEVICE_INERTIAL_SENSOR_SERVICE_H_
 #define CONTENT_BROWSER_DEVICE_SENSORS_DEVICE_INERTIAL_SENSOR_SERVICE_H_
 
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/shared_memory.h"
 #include "base/memory/singleton.h"
 #include "base/threading/thread_checker.h"
 #include "content/browser/device_sensors/inertial_sensor_consts.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 class DataFetcherSharedMemory;
-class RenderProcessHost;
 
-// Owns the DeviceMotionProvider (the background polling thread) and keeps
-// track of the number of consumers currently using the data (and pausing
-// the provider when not in use).
+// Owns the Device(Motion|Orientation)Provider (the background polling thread)

[timvolodine, 2014/05/21 17:53:13]

could you replace the whole comment with:
"Owns the data fetcher for Device Motion and Orientation and keeps track of the
number of consumers currently using the data. The data fetcher is stopped when
there are no consumers."

[riju_, 2014/05/22 11:34:31]

Done.

+// and keeps track of the number of consumers currently using the data (and
+// pausing the provider when not in use).
 class CONTENT_EXPORT DeviceInertialSensorService {
  public:
   // Returns the DeviceInertialSensorService singleton.
   static DeviceInertialSensorService* GetInstance();
 
   // Increments the number of users of the provider. The Provider is running
   // when there's > 0 users, and is paused when the count drops to 0.
   // Must be called on the I/O thread.
   void AddConsumer(ConsumerType consumer_type);
 
@@ skipping 28 matching lines @@
   bool is_shutdown_;
   scoped_ptr<DataFetcherSharedMemory> data_fetcher_;
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceInertialSensorService);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVICE_SENSORS_DEVICE_INERTIAL_SENSOR_SERVICE_H_