Use url::Origin to represent security origins in MediaStream-related code.

third_party/WebKit/Source/platform/mediastream/MediaStreamTrackSourcesRequest.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 #ifndef MediaStreamTrackSourcesRequest_h
 #define MediaStreamTrackSourcesRequest_h
 
 #include "platform/heap/Handle.h"
 #include "public/platform/WebVector.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
+class SecurityOrigin;
 class WebSourceInfo;
 
 class MediaStreamTrackSourcesRequest : public GarbageCollectedFinalized<MediaStreamTrackSourcesRequest> {
 public:
     virtual ~MediaStreamTrackSourcesRequest() { }
 
-    virtual String origin() = 0;
+    virtual PassRefPtr<SecurityOrigin> origin() = 0;
     virtual void requestSucceeded(const WebVector<WebSourceInfo>&) = 0;
 
     DEFINE_INLINE_VIRTUAL_TRACE() { }
 
 protected:
     MediaStreamTrackSourcesRequest() { }
 };
 
 } // namespace blink
 
 #endif // MediaStreamTrackSourcesRequest_h