Move VoiceEngineObserver into AudioSendStream so that we detect typing noises and return properly i…

talk/media/base/fakemediaengine.h

Index: talk/media/base/fakemediaengine.h
diff --git a/talk/media/base/fakemediaengine.h b/talk/media/base/fakemediaengine.h
index a6fa960dee9dbc4476f7220ee8a80b3142fefb46..ea126c1601bf5a9aab663f04882a39135f6162f4 100644
--- a/talk/media/base/fakemediaengine.h
+++ b/talk/media/base/fakemediaengine.h
@@ -733,7 +733,7 @@ class FakeVoiceEngine : public FakeBaseEngine {
   }
   bool Init(rtc::Thread* worker_thread) { return true; }
   void Terminate() {}
-  webrtc::VoiceEngine* GetVoE() { return nullptr; }
+  webrtc::AudioState* GetAudioState() { return nullptr; }
   AudioOptions GetOptions() const {
     return options_;
   }