Revert "Allow MessageFilters to restrict listening to specific message classes"

content/browser/device_orientation/device_motion_message_filter.cc

 // Copyright 2013 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_orientation/device_motion_message_filter.h"
 
 #include "content/browser/device_orientation/device_inertial_sensor_service.h"
 #include "content/common/device_orientation/device_motion_messages.h"
 
 namespace content {
 
 DeviceMotionMessageFilter::DeviceMotionMessageFilter()
-    : BrowserMessageFilter(DeviceMotionMsgStart),
-      is_started_(false) {
+    : is_started_(false) {
 }
 
 DeviceMotionMessageFilter::~DeviceMotionMessageFilter() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   if (is_started_)
     DeviceInertialSensorService::GetInstance()->RemoveConsumer(
         CONSUMER_TYPE_MOTION);
 }
 
 bool DeviceMotionMessageFilter::OnMessageReceived(
@@ skipping 32 matching lines @@
 }
 
 void DeviceMotionMessageFilter::DidStartDeviceMotionPolling() {
   Send(new DeviceMotionMsg_DidStartPolling(
       DeviceInertialSensorService::GetInstance()->
           GetSharedMemoryHandleForProcess(
               CONSUMER_TYPE_MOTION, PeerHandle())));
 }
 
 }  // namespace content