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

content/browser/speech/input_tag_speech_dispatcher_host.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/speech/input_tag_speech_dispatcher_host.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/speech/speech_recognition_manager_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/speech_recognition_messages.h"
 #include "content/public/browser/speech_recognition_manager_delegate.h"
 #include "content/public/browser/speech_recognition_session_config.h"
 #include "content/public/browser/speech_recognition_session_context.h"
 
 namespace {
 const uint32 kMaxHypothesesForSpeechInputTag = 6;
 }
 
 namespace content {
 
 InputTagSpeechDispatcherHost::InputTagSpeechDispatcherHost(
     bool is_guest,
     int render_process_id,
     net::URLRequestContextGetter* url_request_context_getter)
-    : BrowserMessageFilter(SpeechRecognitionMsgStart),
-      is_guest_(is_guest),
+    : is_guest_(is_guest),
       render_process_id_(render_process_id),
       url_request_context_getter_(url_request_context_getter),
       weak_factory_(this) {
   // Do not add any non-trivial initialization here, instead do it lazily when
   // required (e.g. see the method |SpeechRecognitionManager::GetInstance()|) or
   // add an Init() method.
 }
 
 InputTagSpeechDispatcherHost::~InputTagSpeechDispatcherHost() {
   SpeechRecognitionManager::GetInstance()->AbortAllSessionsForRenderProcess(
@@ skipping 179 matching lines @@
 void InputTagSpeechDispatcherHost::OnSoundEnd(int session_id) {}
 void InputTagSpeechDispatcherHost::OnRecognitionError(
     int session_id,
     const SpeechRecognitionError& error) {}
 void InputTagSpeechDispatcherHost::OnAudioLevelsChange(
     int session_id, float volume, float noise_volume) {}
 void InputTagSpeechDispatcherHost::OnEnvironmentEstimationComplete(
     int session_id) {}
 
 }  // namespace content