mac: Delete some pre-OS X 10.9 code in blink

third_party/WebKit/Source/platform/mac/ThemeMac.h

 /*
  * Copyright (C) 2008 Apple 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 44 matching lines @@
         TopMargin = 0,
         RightMargin = 1,
         BottomMargin = 2,
         LeftMargin = 3
     };
     static PLATFORM_EXPORT IntRect inflateRect(const IntRect&, const IntSize&, const int* margins, float zoomLevel = 1.0f);
 
     // Inflate an IntRect to account for any bleeding that would happen due to anti-aliasing.
     static PLATFORM_EXPORT IntRect inflateRectForAA(const IntRect&);
 
-    // Inflate an IntRect to account for its focus ring. This is only used when
-    // drawWithFrameDrawsFocusRing() returns true (otherwise, the focus ring's
-    // bounds could be accurately computed with -[NSCell focusRingMaskBoundsForFrame:inView:]).
+    // Inflate an IntRect to account for its focus ring.
+    // TODO: Consider using computing the focus ring's bounds with
+    // -[NSCell focusRingMaskBoundsForFrame:inView:]).
     static PLATFORM_EXPORT IntRect inflateRectForFocusRing(const IntRect&);
-
-    static PLATFORM_EXPORT bool drawWithFrameDrawsFocusRing();
 };
 
 } // namespace blink
 
 #endif // ThemeMac_h