Move the FontFaceCache stored in CSSFontSelector to be stored in Document.

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

Index: third_party/WebKit/Source/core/css/FontFaceSet.h
diff --git a/third_party/WebKit/Source/core/css/FontFaceSet.h b/third_party/WebKit/Source/core/css/FontFaceSet.h
index a92f209f65a662ea08f55275b8945bd2eaa5dea6..d2884379e174074d5abf63c7f7e4e177e63a65b3 100644
--- a/third_party/WebKit/Source/core/css/FontFaceSet.h
+++ b/third_party/WebKit/Source/core/css/FontFaceSet.h
@@ -49,7 +49,6 @@ namespace blink {
 class CSSFontSelector;
 class ExceptionState;
 class Font;
-class FontFaceCache;
 class ExecutionContext;
 
 using FontFaceSetIterable = PairIterable<Member<FontFace>, Member<FontFace>>;
@@ -107,7 +106,7 @@ class FontFaceSet final : public EventTargetWithInlineData,
 
   static const char* supplementName() { return "FontFaceSet"; }
 
-  void addFontFacesToFontFaceCache(FontFaceCache*, CSSFontSelector*);
+  void addFontFacesToFontFaceCache(CSSFontSelector*);
 
   DECLARE_VIRTUAL_TRACE();