Bug 1137151: Remove ref-counting from |OMXVideoEncoder| r=sotaro

Reference counting in |OMXVideoEncoder| is used inconsistently any actually
not necessary. This patch removed the code. Users are converted to auto
pointers.

dom/media/omx/OMXCodecWrapper.h

@@ -278,7 +278,6 @@ private:
  */
 class OMXVideoEncoder MOZ_FINAL : public OMXCodecWrapper
 {
-  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(OMXVideoEncoder)
 public:
   // Types of output blob format.
   enum BlobFormat {

media/webrtc/signaling/src/media-conduit/WebrtcOMXH264VideoCodec.h

@@ -56,7 +56,7 @@ public:
   virtual int32_t SetRates(uint32_t aBitRate, uint32_t aFrameRate) MOZ_OVERRIDE;
 
 private:
-  RefPtr<android::OMXVideoEncoder> mOMX;
+  nsAutoPtr<android::OMXVideoEncoder> mOMX;
   android::sp<android::OMXCodecReservation> mReservation;
 
   webrtc::EncodedImageCallback* mCallback;