Remove platform/drm files.

Source/modules/encryptedmedia/MediaKeys.h

Index: Source/modules/encryptedmedia/MediaKeys.h
diff --git a/Source/modules/encryptedmedia/MediaKeys.h b/Source/modules/encryptedmedia/MediaKeys.h
index 4915637b362687d2afba6c34a4955d7eb675720e..e66d4f025b806b16e82f1fc7632fb931e3680269 100644
--- a/Source/modules/encryptedmedia/MediaKeys.h
+++ b/Source/modules/encryptedmedia/MediaKeys.h
@@ -47,12 +47,11 @@ class WebContentDecryptionModule;
 
 namespace WebCore {
 
-class ContentDecryptionModule;
 class HTMLMediaElement;
 class ExceptionState;
 
 // References are held by JS and HTMLMediaElement.
-// The ContentDecryptionModule has the same lifetime as this object.
+// The WebContentDecryptionModule has the same lifetime as this object.
 class MediaKeys : public RefCountedWillBeGarbageCollectedFinalized<MediaKeys>, public ContextLifecycleObserver, public ScriptWrappable {
 public:
     static PassRefPtrWillBeRawPtr<MediaKeys> create(ExecutionContext*, const String& keySystem, ExceptionState&);
@@ -74,12 +73,12 @@ public:
     virtual void contextDestroyed() OVERRIDE;
 
 protected:
-    MediaKeys(ExecutionContext*, const String& keySystem, PassOwnPtr<ContentDecryptionModule>);
+    MediaKeys(ExecutionContext*, const String& keySystem, PassOwnPtr<blink::WebContentDecryptionModule>);
     void initializeNewSessionTimerFired(Timer<MediaKeys>*);
 
     HTMLMediaElement* m_mediaElement;
     const String m_keySystem;
-    OwnPtr<ContentDecryptionModule> m_cdm;
+    OwnPtr<blink::WebContentDecryptionModule> m_cdm;
 
     // FIXME: Check whether |initData| can be changed by JS. Maybe we should not pass it as a pointer.
     struct InitializeNewSessionData {