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

content/browser/renderer_host/gamepad_browser_message_filter.cc

 // Copyright (c) 2011 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/renderer_host/gamepad_browser_message_filter.h"
 
 #include "content/browser/gamepad/gamepad_service.h"
 #include "content/common/gamepad_messages.h"
 
 namespace content {
 
 GamepadBrowserMessageFilter::GamepadBrowserMessageFilter()
-    : BrowserMessageFilter(GamepadMsgStart),
-      is_started_(false) {
+    : is_started_(false) {
 }
 
 GamepadBrowserMessageFilter::~GamepadBrowserMessageFilter() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   if (is_started_)
     GamepadService::GetInstance()->RemoveConsumer();
 }
 
 bool GamepadBrowserMessageFilter::OnMessageReceived(
     const IPC::Message& message,
@@ skipping 27 matching lines @@
   // arrive anyway if the renderer crashes, etc.
   if (is_started_) {
     is_started_ = false;
     GamepadService::GetInstance()->RemoveConsumer();
   } else {
     NOTREACHED();
   }
 }
 
 }  // namespace content