Add FontFaceSource interface and make it available on Document

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

Index: third_party/WebKit/Source/core/css/FontFaceSource.h
diff --git a/third_party/WebKit/Source/core/css/DocumentFontFaceSet.h b/third_party/WebKit/Source/core/css/FontFaceSource.h
similarity index 91%
rename from third_party/WebKit/Source/core/css/DocumentFontFaceSet.h
rename to third_party/WebKit/Source/core/css/FontFaceSource.h
index ea2176a300a7a291348b9c576677bbc31a9a1471..0695475dd150a92df41bdf50a6c01890ec3c7fea 100644
--- a/third_party/WebKit/Source/core/css/DocumentFontFaceSet.h
+++ b/third_party/WebKit/Source/core/css/FontFaceSource.h
@@ -23,8 +23,8 @@
  * DAMAGE.
  */
 
-#ifndef DocumentFontFaceSet_h
-#define DocumentFontFaceSet_h
+#ifndef FontFaceSource_h
+#define FontFaceSource_h
 
 #include "platform/heap/Handle.h"
 #include "platform/wtf/Allocator.h"
@@ -35,8 +35,8 @@ namespace blink {
 class Document;
 class FontFaceSet;
 
-class DocumentFontFaceSet {
-  STATIC_ONLY(DocumentFontFaceSet);
+class FontFaceSource {
+  STATIC_ONLY(FontFaceSource);
 
  public:
   static FontFaceSet* fonts(Document&);
@@ -44,4 +44,4 @@ class DocumentFontFaceSet {
 
 }  // namespace blink
 
-#endif  // DocumentFontFaceSet_h
+#endif  // FontFaceSource_h