Introduce InspectorIdentifiers<> and use it to assign/lookup LocalFrame and DocumentLoader

Source/core/inspector/InspectorInstrumentation.idl

 /*
 * Copyright (C) 2013 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
@@ skipping 297 matching lines @@
     [Page]
     void frameDetachedFromParent([Keep] LocalFrame*);
 
     [Resource, DOM, Page]
     void didCommitLoad([Keep] LocalFrame*, DocumentLoader*);
 
     [DOM, Inline=FastReturn]
     void frameDocumentUpdated([Keep] LocalFrame*);
 
     [Page]
-    void loaderDetachedFromFrame(LocalFrame*, DocumentLoader*);
-
-    [Page]
     void frameStartedLoading([Keep] LocalFrame*);
 
     [Page]
     void frameStoppedLoading([Keep] LocalFrame*);
 
     [Page, Resource]
     void frameScheduledNavigation([Keep] LocalFrame*, double delay);
 
     [Page, Resource]
     void frameClearedScheduledNavigation([Keep] LocalFrame*);
@@ skipping 120 matching lines @@
 interface InspectorOverrides {
     [CSS, Inline=FastReturn]
     bool forcePseudoState([Keep] Element* element, CSSSelector::PseudoType pseudoState);
 
     [Worker, Inline=FastReturn]
     bool shouldPauseDedicatedWorkerOnStart(ExecutionContext* context);
 
     [Resource, Inline=FastReturn]
     bool shouldForceCORSPreflight(Document*);
 }