Replace generic Dictionary with DictionaryPluginPlaceholderOptions

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 271 matching lines @@
     // This function is for testing HitRegions on Canvas2D.
     unsigned long countHitRegions(CanvasRenderingContext2D context);
 
     [TypeChecking=Interface] ClientRect boundsInRootViewSpace(Element element);
     DOMString serializeNavigationMarkup();
     DOMString[] getTransitionElementIds();
     ClientRectList getTransitionElementRects();
     void hideAllTransitionElements();
 
     [RaisesException, TypeChecking=Interface] void forcePluginPlaceholder(HTMLElement plugin, DocumentFragment fragment);
-    [RaisesException, TypeChecking=Interface] void forcePluginPlaceholder(HTMLElement plugin, Dictionary options);
+    [RaisesException, TypeChecking=Interface] void forcePluginPlaceholder(HTMLElement plugin, PluginPlaceholderOptions options);
 
     DictionaryTest dictionaryTest();
     UnionTypesTest unionTypesTest();
 };