DevTools: do not use Internals for inspector highlight tests.

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 165 matching lines @@
     [RaisesException, TypeChecking=Interface] ClientRectList nonFastScrollableRects(Document document);
 
     [TypeChecking=Interface] void garbageCollectDocumentResources(Document document);
     void evictAllResources();
 
     unsigned long numberOfLiveNodes();
     unsigned long numberOfLiveDocuments();
     DOMString dumpRefCountedInstanceCounts();
     sequence<DOMString> consoleMessageArgumentCounts(Document document);
     unsigned long[] setMemoryCacheCapacities(unsigned long minDeadBytes, unsigned long maxDeadBytes, unsigned long totalBytes);
-    [RaisesException] DOMString inspectorHighlightJSON(Node node);
 
     DOMString counterValue(Element element);
     long pageNumber(Element element, optional float pageWidth, optional float pageHeight);
     DOMString[] shortcutIconURLs(Document document);
     DOMString[] allIconURLs(Document document);
     long numberOfPages(optional double pageWidthInPixels, optional double pageHeightInPixels);
     [RaisesException] DOMString pageProperty(DOMString propertyName, long pageNumber);
     [RaisesException] DOMString pageSizeAndMarginsInPixels(long pageIndex, long width, long height, long marginTop, long marginRight, long marginBottom, long marginLeft);
 
     [RaisesException] void setDeviceScaleFactor(float scaleFactor);
@@ skipping 97 matching lines @@
     [RaisesException, TypeChecking=Interface] void forcePluginPlaceholder(HTMLElement plugin, DocumentFragment fragment);
     [RaisesException, TypeChecking=Interface] void forcePluginPlaceholder(HTMLElement plugin, PluginPlaceholderOptions options);
 
     DictionaryTest dictionaryTest();
     UnionTypesTest unionTypesTest();
 
     void forceBlinkGCWithoutV8GC();
 
     iterable<long>;
 };