Make configurationForViewport match production code

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 88 matching lines @@
     [RaisesException] Range markerRangeForNode(Node node, DOMString markerType, unsigned long index);
     [RaisesException] DOMString markerDescriptionForNode(Node node, DOMString markerType, unsigned long index);
     void addTextMatchMarker(Range range, boolean isActive);
 
     [RaisesException] void setScrollViewPosition(Document document, long x, long y);
 
     [RaisesException] void setPagination(Document document, DOMString mode, long gap, optional long pageLength);
 
     [RaisesException] DOMString configurationForViewport(Document document,
                                        float devicePixelRatio,
-                                       long deviceWidth,
-                                       long deviceHeight,
                                        long availableWidth,
                                        long availableHeight);
 
     [RaisesException] boolean wasLastChangeUserEdit(Element textField);
     [RaisesException] boolean elementShouldAutoComplete(Element inputElement);
     [RaisesException] DOMString suggestedValue(Element inputElement);
     [RaisesException] void setSuggestedValue(Element inputElement, DOMString value);
     [RaisesException] void setEditingValue(Element inputElement, DOMString value);
     [RaisesException] void setAutofilled(Element inputElement, boolean enabled);
 
@@ skipping 132 matching lines @@
     void enableMockSpeechSynthesizer();
 
     [RaisesException] DOMString getImageSourceURL(Element element);
 
     boolean isSelectPopupVisible(Node node);
 
     [RaisesException] ClientRect selectionBounds();
 
     boolean loseSharedGraphicsContext3D();
 };