Make unprefixed EME APIs use platform and Chromium.

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 9691cfe40c3ec3de6b8da343d924ace605226028..c437d965fa7134e4531d69891fe6312e26f21ba4 100644
--- a/Source/modules/encryptedmedia/MediaKeys.h
+++ b/Source/modules/encryptedmedia/MediaKeys.h
@@ -31,7 +31,6 @@
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/dom/EventTarget.h"
 #include "core/dom/ExceptionCode.h"
-#include "modules/encryptedmedia/CDM.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
@@ -41,10 +40,15 @@
 
 namespace WebCore {
 
+class CDM;
 class MediaKeySession;
 class HTMLMediaElement;
 
-class MediaKeys : public RefCounted<MediaKeys>, public ScriptWrappable, public CDMClient {
+// References are held by JS and HTMLMediaElement.
+// The CDM has the same lifetime as this object.
+// Maintains a reference to all MediaKeySessions created to ensure they live as
+// long as this object unless explicitly close()'d.
+class MediaKeys : public RefCounted<MediaKeys>, public ScriptWrappable {
 public:
     static PassRefPtr<MediaKeys> create(const String& keySystem, ExceptionCode&);
     ~MediaKeys();
@@ -52,21 +56,16 @@ public:
     PassRefPtr<MediaKeySession> createSession(ScriptExecutionContext*, const String& mimeType, Uint8Array* initData, ExceptionCode&);
 
     const String& keySystem() const { return m_keySystem; }
-    CDM* cdm() { return m_cdm.get(); }
 
-    HTMLMediaElement* mediaElement() const { return m_mediaElement; }
     void setMediaElement(HTMLMediaElement*);
 
 protected:
-    // CDMClient:
-    virtual MediaPlayer* cdmMediaPlayer(const CDM*) const OVERRIDE;
-
     MediaKeys(const String& keySystem, PassOwnPtr<CDM>);
 
     Vector<RefPtr<MediaKeySession> > m_sessions;
 
     HTMLMediaElement* m_mediaElement;
-    String m_keySystem;
+    const String m_keySystem;
     OwnPtr<CDM> m_cdm;
 };