Remove ProcessingComponent's dependence on AudioProcessingImpl.

- Move needed accessors to AudioProcessing.
- Inject the crit directly as a dependency.
- Remove the now unneeded EchoCancellationImplWrapper.

BUG=2894
R=aluebs@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/9199004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5620 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_processing/voice_detection_impl.h b/webrtc/modules/audio_processing/voice_detection_impl.h
index f8f50e8..5d06517 100644
--- a/webrtc/modules/audio_processing/voice_detection_impl.h
+++ b/webrtc/modules/audio_processing/voice_detection_impl.h
@@ -15,13 +15,14 @@
 #include "webrtc/modules/audio_processing/processing_component.h"
 
 namespace webrtc {
-class AudioProcessingImpl;
+
 class AudioBuffer;
+class CriticalSectionWrapper;
 
 class VoiceDetectionImpl : public VoiceDetection,
                            public ProcessingComponent {
  public:
-  explicit VoiceDetectionImpl(const AudioProcessingImpl* apm);
+  VoiceDetectionImpl(const AudioProcessing* apm, CriticalSectionWrapper* crit);
   virtual ~VoiceDetectionImpl();
 
   int ProcessCaptureAudio(AudioBuffer* audio);
@@ -50,7 +51,8 @@
   virtual int num_handles_required() const OVERRIDE;
   virtual int GetHandleError(void* handle) const OVERRIDE;
 
-  const AudioProcessingImpl* apm_;
+  const AudioProcessing* apm_;
+  CriticalSectionWrapper* crit_;
   bool stream_has_voice_;
   bool using_external_vad_;
   Likelihood likelihood_;