Rename drawSystemFocusRing() to drawFocusIfNeeded()

Source/core/html/canvas/CanvasRenderingContext2D.idl

 /*
  * Copyright (C) 2006 Apple Computer, 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 150 matching lines @@
 
     [Custom] attribute object strokeStyle;
     [Custom] attribute object fillStyle;
 
     // pixel manipulation
     [RaisesException] ImageData getImageData(float sx, float sy, float sw, float sh);
 
     [RaisesException, DeprecateAs=PrefixedGetImageDataHD] ImageData webkitGetImageDataHD(float sx, float sy, float sw, float sh);
 
     // Focus rings
-    [RuntimeEnabled=ExperimentalCanvasFeatures] void drawSystemFocusRing(Element element);
+    [RuntimeEnabled=ExperimentalCanvasFeatures] void drawFocusIfNeeded(Element element);
     [RuntimeEnabled=ExperimentalCanvasFeatures] boolean drawCustomFocusRing(Element element);
 
     readonly attribute float webkitBackingStorePixelRatio;
 
     [ImplementedAs=imageSmoothingEnabled, MeasureAs=PrefixedImageSmoothingEnabled] attribute boolean webkitImageSmoothingEnabled;
     [MeasureAs=UnprefixedImageSmoothingEnabled] attribute boolean imageSmoothingEnabled;
 
     Canvas2DContextAttributes getContextAttributes();
 };
 
 CanvasRenderingContext2D implements CanvasPathMethods;