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

chrome/browser/plugins/plugin_info_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 "chrome/browser/plugins/plugin_info_message_filter.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
@@ skipping 73 matching lines @@
       resource_context_(NULL),
       host_content_settings_map_(NULL) {
 }
 
 PluginInfoMessageFilter::Context::~Context() {
 }
 
 PluginInfoMessageFilter::PluginInfoMessageFilter(
     int render_process_id,
     Profile* profile)
-    : BrowserMessageFilter(ChromeMsgStart),
-      context_(render_process_id, profile),
+    : context_(render_process_id, profile),
       weak_ptr_factory_(this) {
 }
 
 bool PluginInfoMessageFilter::OnMessageReceived(const IPC::Message& message,
                                                 bool* message_was_ok) {
   IPC_BEGIN_MESSAGE_MAP_EX(PluginInfoMessageFilter, message, *message_was_ok)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(ChromeViewHostMsg_GetPluginInfo,
                                     OnGetPluginInfo)
     IPC_MESSAGE_HANDLER(
         ChromeViewHostMsg_IsInternalPluginRegisteredForMimeType,
@@ skipping 277 matching lines @@
 void PluginInfoMessageFilter::Context::MaybeGrantAccess(
     const ChromeViewHostMsg_GetPluginInfo_Status& status,
     const base::FilePath& path) const {
   if (status.value == ChromeViewHostMsg_GetPluginInfo_Status::kAllowed ||
       status.value == ChromeViewHostMsg_GetPluginInfo_Status::kClickToPlay) {
     ChromePluginServiceFilter::GetInstance()->AuthorizePlugin(
         render_process_id_, path);
   }
 }