Notify hotwording extension of microphone state change.

chrome/browser/search/hotword_service_factory.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 "chrome/browser/search/hotword_service_factory.h"
 
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/hotword_service.h"
@@ skipping 41 matching lines @@
 }
 
 // static
 int HotwordServiceFactory::GetCurrentError(BrowserContext* context) {
   HotwordService* hotword_service = GetForProfile(context);
   if (!hotword_service)
     return 0;
   return hotword_service->error_message();
 }
 
-// static
-bool HotwordServiceFactory::IsMicrophoneAvailable() {
-  return GetInstance()->microphone_available();
-}
-
-// static
-bool HotwordServiceFactory::IsAudioDeviceStateUpdated() {
-  return GetInstance()->audio_device_state_updated();
-}
-
 HotwordServiceFactory::HotwordServiceFactory()
     : BrowserContextKeyedServiceFactory(
         "HotwordService",
-        BrowserContextDependencyManager::GetInstance()),
-      microphone_available_(false),
-      audio_device_state_updated_(false) {
+        BrowserContextDependencyManager::GetInstance()) {
   // No dependencies.
-
-  // Register with the device observer list to update the microphone
-  // availability.
-  BrowserThread::PostTask(
-      BrowserThread::UI, FROM_HERE,
-      base::Bind(&HotwordServiceFactory::InitializeMicrophoneObserver,
-                 base::Unretained(this)));
 }
 
 HotwordServiceFactory::~HotwordServiceFactory() {
 }
 
-void HotwordServiceFactory::InitializeMicrophoneObserver() {
-  MediaCaptureDevicesDispatcher::GetInstance()->AddObserver(this);
-}
-
-void HotwordServiceFactory::OnUpdateAudioDevices(
-    const content::MediaStreamDevices& devices) {
-  microphone_available_ = !devices.empty();
-  audio_device_state_updated_ = true;
-}
-
 void HotwordServiceFactory::UpdateMicrophoneState() {
   // In order to trigger the monitor, just call getAudioCaptureDevices.
   content::MediaStreamDevices devices =
     MediaCaptureDevicesDispatcher::GetInstance()->GetAudioCaptureDevices();
 }
 
 void HotwordServiceFactory::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* prefs) {
   prefs->RegisterBooleanPref(prefs::kHotwordAudioLoggingEnabled,
                              false,
@@ skipping 10 matching lines @@
                              user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
   prefs->RegisterBooleanPref(prefs::kHotwordAlwaysOnNotificationSeen,
                              false,
                              user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 KeyedService* HotwordServiceFactory::BuildServiceInstanceFor(
     BrowserContext* context) const {
   return new HotwordService(Profile::FromBrowserContext(context));
 }