Bug 1105201 - [RTSP] Can't play if tap pause/play continuously. r=bechen

dom/media/omx/RtspMediaCodecReader.h

@@ -49,7 +49,7 @@ public:
   // ChannelMediaResource, it has a "cache" that can store the whole streaming
   // data so the |GetBuffered| function can retrieve useful time ranges.
   virtual nsresult GetBuffered(dom::TimeRanges* aBuffered) MOZ_OVERRIDE {
-    return NS_OK;
+    return NS_ERROR_NOT_IMPLEMENTED;
   }
 
   virtual void SetIdle() MOZ_OVERRIDE;

dom/media/omx/RtspOmxReader.h

@@ -59,7 +59,7 @@ public:
   // ChannelMediaResource, it has a "cache" that can store the whole streaming
   // data so the |GetBuffered| function can retrieve useful time ranges.
   virtual nsresult GetBuffered(mozilla::dom::TimeRanges* aBuffered) MOZ_FINAL MOZ_OVERRIDE {
-    return NS_OK;
+    return NS_ERROR_NOT_IMPLEMENTED;
   }
 
   virtual void SetIdle() MOZ_OVERRIDE;