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

content/browser/browser_plugin/browser_plugin_message_filter.cc

 // Copyright (c) 2012 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/browser_plugin/browser_plugin_message_filter.h"
 
 #include "base/supports_user_data.h"
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/browser/browser_plugin/browser_plugin_guest_manager.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/browser_plugin/browser_plugin_constants.h"
 #include "content/common/browser_plugin/browser_plugin_messages.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_view_host.h"
 
 namespace content {
 
 BrowserPluginMessageFilter::BrowserPluginMessageFilter(int render_process_id,
                                                        bool is_guest)
-    : BrowserMessageFilter(BrowserPluginMsgStart),
-      render_process_id_(render_process_id),
+    : render_process_id_(render_process_id),
       is_guest_(is_guest) {
 }
 
 BrowserPluginMessageFilter::~BrowserPluginMessageFilter() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 }
 
 bool BrowserPluginMessageFilter::OnMessageReceived(
     const IPC::Message& message,
     bool* message_was_ok) {
@@ skipping 30 matching lines @@
   if (!host)
     return NULL;
 
   BrowserContext* browser_context = host->GetBrowserContext();
   return static_cast<BrowserPluginGuestManager*>(
       browser_context->GetUserData(
           browser_plugin::kBrowserPluginGuestManagerKeyName));
 }
 
 } // namespace content