Decouple performance() from LocalDOMWindow

Source/core/frame/RemoteDOMWindow.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/frame/RemoteDOMWindow.h"
 
 #include "bindings/core/v8/SerializedScriptValue.h"
 #include "core/css/CSSRuleList.h"
 #include "core/css/CSSStyleDeclaration.h"
@@ skipping 191 matching lines @@
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 Console* RemoteDOMWindow::console() const
 {
     ASSERT_NOT_REACHED();
     return 0;
 }
 
-Performance* RemoteDOMWindow::performance() const
-{
-    ASSERT_NOT_REACHED();
-    return 0;
-}
-
 DOMWindowCSS* RemoteDOMWindow::css() const
 {
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 DOMSelection* RemoteDOMWindow::getSelection()
 {
     ASSERT_NOT_REACHED();
     return 0;
@@ skipping 136 matching lines @@
 {
     return String();
 }
 
 RemoteDOMWindow::RemoteDOMWindow(RemoteFrame& frame)
     : m_frame(&frame)
 {
 }
 
 } // namespace blink