Convert some Internals APIs to use DOMPoint instead of WebKitPoint

Source/core/testing/Internals.idl

Index: Source/core/testing/Internals.idl
diff --git a/Source/core/testing/Internals.idl b/Source/core/testing/Internals.idl
index 1329db719d70348b09077f009b2af06e21d57070..b34ba01a976dfa693b85da6f63adef4d0aba444d 100644
--- a/Source/core/testing/Internals.idl
+++ b/Source/core/testing/Internals.idl
@@ -116,9 +116,9 @@
     [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);