Add FontFaceSource interface and make it available on Document

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

Index: third_party/WebKit/Source/core/css/FontFaceSource.cpp
diff --git a/third_party/WebKit/Source/core/css/DocumentFontFaceSet.cpp b/third_party/WebKit/Source/core/css/FontFaceSource.cpp
similarity index 93%
rename from third_party/WebKit/Source/core/css/DocumentFontFaceSet.cpp
rename to third_party/WebKit/Source/core/css/FontFaceSource.cpp
index f2862c513841e14b069405221b1b0ac1a080931f..a2279914dc1d1a283674c92351ccfa5cf8bc05cd 100644
--- a/third_party/WebKit/Source/core/css/DocumentFontFaceSet.cpp
+++ b/third_party/WebKit/Source/core/css/FontFaceSource.cpp
@@ -23,13 +23,13 @@
  * DAMAGE.
  */
 
-#include "core/css/DocumentFontFaceSet.h"
+#include "core/css/FontFaceSource.h"
 
 #include "core/css/FontFaceSet.h"
 
 namespace blink {
 
-FontFaceSet* DocumentFontFaceSet::fonts(Document& document) {
+FontFaceSet* FontFaceSource::fonts(Document& document) {
   return FontFaceSet::From(document);
 }