IDL: Remove support for [LogPreviousValue] extended attribute

Source/bindings/core/v8/V8DOMActivityLogger.h

 /*
  * Copyright (C) 2009 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 27 matching lines @@
 namespace blink {
 
 class KURL;
 
 class V8DOMActivityLogger {
 public:
     virtual ~V8DOMActivityLogger() { }
 
     virtual void logGetter(const String& apiName) { }
     virtual void logSetter(const String& apiName, const v8::Handle<v8::Value>& newValue) { }
-    virtual void logSetter(const String& apiName, const v8::Handle<v8::Value>& newValue, const v8::Handle<v8::Value>& oldValue) { }
     virtual void logMethod(const String& apiName, int argc, const v8::Handle<v8::Value>* argv) { }
     virtual void logEvent(const String& eventName, int argc, const String* argv) { }
 
     // Associates a logger with the world identified by worldId (worlId may be 0
     // identifying the main world) and extension ID. Extension ID is used to
     // identify a logger for main world only (worldId == 0). If the world is not
     // a main world, an extension ID is ignored.
     //
     // A renderer process may host multiple extensions when the browser hits the
     // renderer process limit. In such case, we assign multiple extensions to
     // the same main world of a renderer process. In order to distinguish the
     // extensions and their activity loggers in the main world, we require an
     // extension ID. Otherwise, extension activities may be logged under
     // a wrong extension ID.
     static void setActivityLogger(int worldId, const String&, PassOwnPtr<V8DOMActivityLogger>);
     static V8DOMActivityLogger* activityLogger(int worldId, const String& extensionId);
     static V8DOMActivityLogger* activityLogger(int worldId, const KURL&);
 
     // Returns activity logger for current V8 context or 0.
     static V8DOMActivityLogger* currentActivityLogger();
     // Returns activity logger for current V8 context if the context belongs to
     // an isolated world or 0.
     static V8DOMActivityLogger* currentActivityLoggerIfIsolatedWorld();
 
 };
 
 } // namespace blink
 
 #endif // V8DOMActivityLogger_h