Make the CSS interface members static

Source/core/frame/DOMWindow.h

 // 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.
 
 #ifndef DOMWindow_h
 #define DOMWindow_h
 
 #include "core/CoreExport.h"
 #include "core/events/EventTarget.h"
 #include "core/frame/DOMWindowBase64.h"
@@ skipping 111 matching lines @@
 
     virtual ApplicationCache* applicationCache() const = 0;
 
     // This is the interface orientation in degrees. Some examples are:
     //  0 is straight up; -90 is when the device is rotated 90 clockwise;
     //  90 is when rotated counter clockwise.
     virtual int orientation() const = 0;
 
     virtual Console* console() const  = 0;
 
-    virtual DOMWindowCSS* css() const = 0;
-
     virtual DOMSelection* getSelection() = 0;
 
     virtual void focus(ExecutionContext*) = 0;
     virtual void blur() = 0;
     virtual void close(ExecutionContext*) = 0;
     virtual void print() = 0;
     virtual void stop() = 0;
 
     virtual void alert(const String& message = String()) = 0;
     virtual bool confirm(const String& message) = 0;
@@ skipping 85 matching lines @@
     // implementation details to scripts.
     bool m_windowIsClosing;
 
 private:
     mutable RefPtrWillBeMember<Location> m_location;
 };
 
 } // namespace blink
 
 #endif // DOMWindow_h