Generalize AesDecryptor to make it more spec compliant.

media/filters/pipeline_integration_test_base.h

Index: media/filters/pipeline_integration_test_base.h
diff --git a/media/filters/pipeline_integration_test_base.h b/media/filters/pipeline_integration_test_base.h
index 4fcb33b664b8037857d5e2d78db2da7515ecb797..1268b39320e970d7329cd766f7c2bd44106a284d 100644
--- a/media/filters/pipeline_integration_test_base.h
+++ b/media/filters/pipeline_integration_test_base.h
@@ -18,8 +18,6 @@
 
 namespace media {
 
-class AesDecryptor;
-
 // Empty MD5 hash string.  Used to verify empty audio or video tracks.
 extern const char kNullHash[];
 
@@ -74,7 +72,6 @@ class PipelineIntegrationTestBase {
   bool hashing_enabled_;
   scoped_ptr<MessageLoopFactory> message_loop_factory_;
   scoped_refptr<Pipeline> pipeline_;
-  scoped_ptr<AesDecryptor> decryptor_;
   scoped_refptr<FFmpegVideoDecoder> decoder_;
   scoped_refptr<VideoRendererBase> renderer_;
   scoped_refptr<NullAudioSink> audio_sink_;