media: Reland "Simplify {Audio|Video}Decoder initialization callback."

media/filters/decoder_selector.h

Index: media/filters/decoder_selector.h
diff --git a/media/filters/decoder_selector.h b/media/filters/decoder_selector.h
index 59c90f57644926817e2c94c2ba75d7d8bf7bedf4..9fa591e2b8f614eb6d8b1ebaf2a4659d827e352e 100644
--- a/media/filters/decoder_selector.h
+++ b/media/filters/decoder_selector.h
@@ -74,10 +74,10 @@ class MEDIA_EXPORT DecoderSelector {
                      const base::Closure& waiting_for_decryption_key_cb);
 
  private:
-  void DecryptingDecoderInitDone(PipelineStatus status);
+  void DecryptingDecoderInitDone(bool success);
   void DecryptingDemuxerStreamInitDone(PipelineStatus status);
   void InitializeDecoder();
-  void DecoderInitDone(PipelineStatus status);
+  void DecoderInitDone(bool success);
   void ReturnNullDecoder();
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;