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

webrtc/modules/audio_processing/level_estimator_impl.h

@@ -15,13 +15,15 @@
 #include "webrtc/modules/audio_processing/processing_component.h"
 
 namespace webrtc {
-class AudioProcessingImpl;
+
 class AudioBuffer;
+class CriticalSectionWrapper;
 
 class LevelEstimatorImpl : public LevelEstimator,
                            public ProcessingComponent {
  public:
-  explicit LevelEstimatorImpl(const AudioProcessingImpl* apm);
+  LevelEstimatorImpl(const AudioProcessing* apm,
+                     CriticalSectionWrapper* crit);
   virtual ~LevelEstimatorImpl();
 
   int ProcessStream(AudioBuffer* audio);
@@ -42,8 +44,10 @@ class LevelEstimatorImpl : public LevelEstimator,
   virtual int num_handles_required() const OVERRIDE;
   virtual int GetHandleError(void* handle) const OVERRIDE;
 
-  const AudioProcessingImpl* apm_;
+  const AudioProcessing* apm_;
+  CriticalSectionWrapper* crit_;
 };
+
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_ESTIMATOR_IMPL_H_