Make WebMediaPlayerClient inheritance private in HTMLMediaElement

Source/core/html/HTMLMediaElement.h

Index: Source/core/html/HTMLMediaElement.h
diff --git a/Source/core/html/HTMLMediaElement.h b/Source/core/html/HTMLMediaElement.h
index 0a528db4f758241281d6d01441c1fab6bbb26998..bdfa2576e87501c1ddd72b86a0ec078335f70446 100644
--- a/Source/core/html/HTMLMediaElement.h
+++ b/Source/core/html/HTMLMediaElement.h
@@ -66,11 +66,7 @@ class TimeRanges;
 class URLRegistry;
 class VideoTrackList;
 
-// TODO(srirama.m): Make the WebMediaPlayerClient inheritance private by
-// adding a means for getting a WebMediaPlayerEncryptedMediaClient and
-// WebContentDecryptionModule from an HTMLMediaElement and calling
-// WebFrameClient::createMediaPlayer() directly.
-class CORE_EXPORT HTMLMediaElement : public HTMLElement, public WillBeHeapSupplementable<HTMLMediaElement>, public WebMediaPlayerClient, public ActiveDOMObject {
+class CORE_EXPORT HTMLMediaElement : public HTMLElement, public WillBeHeapSupplementable<HTMLMediaElement>, public ActiveDOMObject, private WebMediaPlayerClient {
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLMediaElement);
     WILL_BE_USING_PRE_FINALIZER(HTMLMediaElement, dispose);