IDL: Remove support for [LogPreviousValue] extended attribute

Source/web/WebDOMActivityLogger.cpp

 /*
  * Copyright (C) 2012 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 39 matching lines @@
     virtual void logGetter(const String& apiName) OVERRIDE
     {
         m_domActivityLogger->logGetter(WebString(apiName), getURL(), getTitle());
     }
 
     virtual void logSetter(const String& apiName, const v8::Handle<v8::Value>& newValue) OVERRIDE
     {
         m_domActivityLogger->logSetter(WebString(apiName), newValue, getURL(), getTitle());
     }
 
-    virtual void logSetter(const String& apiName, const v8::Handle<v8::Value>& newValue, const v8::Handle<v8::Value>& oldValue) OVERRIDE
-    {
-        m_domActivityLogger->logSetter(WebString(apiName), newValue, oldValue, getURL(), getTitle());
-    }
-
     virtual void logMethod(const String& apiName, int argc, const v8::Handle<v8::Value>* argv) OVERRIDE
     {
         m_domActivityLogger->logMethod(WebString(apiName), argc, argv, getURL(), getTitle());
     }
 
     virtual void logEvent(const String& eventName, int argc, const String* argv) OVERRIDE
     {
         Vector<WebString> webStringArgv;
         for (int i = 0; i < argc; i++)
             webStringArgv.append(argv[i]);
@@ skipping 23 matching lines @@
     return V8DOMActivityLogger::activityLogger(worldId, extensionId);
 }
 
 void setDOMActivityLogger(int worldId, const WebString& extensionId, WebDOMActivityLogger* logger)
 {
     ASSERT(logger);
     V8DOMActivityLogger::setActivityLogger(worldId, extensionId, adoptPtr(new DOMActivityLoggerContainer(adoptPtr(logger))));
 }
 
 } // namespace blink