Convert some Internals APIs to use DOMPoint instead of WebKitPoint

Source/core/testing/Internals.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 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.
@@ skipping 98 matching lines @@
     [RaisesException, TypeChecking=Interface] void setEditingValue(Element inputElement, DOMString value);
     [RaisesException, TypeChecking=Interface] void setAutofilled(Element inputElement, boolean enabled);
 
     [RaisesException, TypeChecking=Interface] void scrollElementToRect(Element element, long x, long y, long w, long h);
 
     [TypeChecking=Interface] Range rangeFromLocationAndLength(Element scope, long rangeLocation, long rangeLength);
     [TypeChecking=Interface] unsigned long locationFromRange(Element scope, Range range);
     [TypeChecking=Interface] unsigned long lengthFromRange(Element scope, Range range);
     [TypeChecking=Interface] DOMString rangeAsText(Range range);
 
-    [RaisesException, TypeChecking=Interface] WebKitPoint touchPositionAdjustedToBestClickableNode(long x, long y, long width, long height, Document document);
+    [RaisesException, TypeChecking=Interface] DOMPoint touchPositionAdjustedToBestClickableNode(long x, long y, long width, long height, Document document);
     [RaisesException, TypeChecking=Interface] Node touchNodeAdjustedToBestClickableNode(long x, long y, long width, long height, Document document);
-    [RaisesException, TypeChecking=Interface] WebKitPoint touchPositionAdjustedToBestContextMenuNode(long x, long y, long width, long height, Document document);
+    [RaisesException, TypeChecking=Interface] DOMPoint touchPositionAdjustedToBestContextMenuNode(long x, long y, long width, long height, Document document);
     [RaisesException, TypeChecking=Interface] Node touchNodeAdjustedToBestContextMenuNode(long x, long y, long width, long height, Document document);
     [RaisesException, TypeChecking=Interface] ClientRect bestZoomableAreaForTouchPoint(long x, long y, long width, long height, Document document);
 
     [RaisesException] long lastSpellCheckRequestSequence(Document document);
     [RaisesException] long lastSpellCheckProcessedSequence(Document document);
 
     sequence<DOMString> userPreferredLanguages();
     void setUserPreferredLanguages(sequence<DOMString> languages);
 
     [TypeChecking=Interface] unsigned long activeDOMObjectCount(Document document);
@@ skipping 141 matching lines @@
     // This function is for testing HitRegions on Canvas2D.
     unsigned long countHitRegions(CanvasRenderingContext2D context);
 
     DOMString serializeNavigationMarkup();
     void hideAllTransitionElements();
 
     [RaisesException] void forcePluginPlaceholder(HTMLElement plugin, DOMString htmlSource);
 
     DictionaryTest dictionaryTest();
 };