Notify hotwording extension of microphone state change.

chrome/browser/ui/webui/voice_search_ui.cc

Index: chrome/browser/ui/webui/voice_search_ui.cc
diff --git a/chrome/browser/ui/webui/voice_search_ui.cc b/chrome/browser/ui/webui/voice_search_ui.cc
index 6731445ba4b49ed0a4761a55091f49b390d14f7e..b676d3b411440b7cfbab6b8e2c279095fff9e4bd 100644
--- a/chrome/browser/ui/webui/voice_search_ui.cc
+++ b/chrome/browser/ui/webui/voice_search_ui.cc
@@ -270,9 +270,11 @@ class VoiceSearchDomHandler : public WebUIMessageHandler {
 
     AddPair(list, "NaCl Enabled", nacl_enabled);
 
-    AddPair(list,
-            "Microphone",
-            HotwordServiceFactory::IsMicrophoneAvailable() ? "Yes" : "No");
+    HotwordService* hotword_service =
+        HotwordServiceFactory::GetForProfile(profile_);
+    AddPair(list, "Microphone",
+            hotword_service && hotword_service->microphone_available() ? "Yes"
+                                                                       : "No");
 
     std::string audio_capture = "No";
     if (profile_->GetPrefs()->GetBoolean(prefs::kAudioCaptureAllowed))