Add Decryptor interface.

media/filters/ffmpeg_video_decoder.h

Index: media/filters/ffmpeg_video_decoder.h
diff --git a/media/filters/ffmpeg_video_decoder.h b/media/filters/ffmpeg_video_decoder.h
index 3c4d39a4a7ee90639c189d2d85be5a4ee4b9d09f..f4937920fe9ce12f79b0b0e6648049ad8a0e5064 100644
--- a/media/filters/ffmpeg_video_decoder.h
+++ b/media/filters/ffmpeg_video_decoder.h
@@ -10,7 +10,6 @@
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "media/base/video_decoder.h"
-#include "media/crypto/aes_decryptor.h"
 
 class MessageLoop;
 
@@ -20,6 +19,7 @@ struct AVFrame;
 namespace media {
 
 class DecoderBuffer;
+class Decryptor;
 
 class MEDIA_EXPORT FFmpegVideoDecoder : public VideoDecoder {
  public:
@@ -36,7 +36,7 @@ class MEDIA_EXPORT FFmpegVideoDecoder : public VideoDecoder {
 
   // Must be called prior to initialization if decrypted buffers will be
   // encountered.
-  void set_decryptor(AesDecryptor* decryptor);
+  void set_decryptor(Decryptor* decryptor);
 
  protected:
   virtual ~FFmpegVideoDecoder();
@@ -102,7 +102,7 @@ class MEDIA_EXPORT FFmpegVideoDecoder : public VideoDecoder {
   // Pointer to the demuxer stream that will feed us compressed buffers.
   scoped_refptr<DemuxerStream> demuxer_stream_;
 
-  AesDecryptor* decryptor_;
+  Decryptor* decryptor_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegVideoDecoder);
 };