Add FontFaceSource interface and make it available on Document

third_party/WebKit/Source/core/css/FontFaceSource.h

 /*
  * Copyright (C) 2013, Google Inc. All rights reserved.
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-#ifndef DocumentFontFaceSet_h
-#define DocumentFontFaceSet_h
+#ifndef FontFaceSource_h
+#define FontFaceSource_h
 
 #include "platform/heap/Handle.h"
 #include "platform/wtf/Allocator.h"
 #include "platform/wtf/PassRefPtr.h"
 
 namespace blink {
 
 class Document;
 class FontFaceSet;
 
-class DocumentFontFaceSet {
-  STATIC_ONLY(DocumentFontFaceSet);
+class FontFaceSource {
+  STATIC_ONLY(FontFaceSource);
 
  public:
   static FontFaceSet* fonts(Document&);
 };
 
 }  // namespace blink
 
-#endif  // DocumentFontFaceSet_h
+#endif  // FontFaceSource_h