Make the CSS interface members static

Source/core/frame/RemoteDOMWindow.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 RemoteDOMWindow_h
 #define RemoteDOMWindow_h
 
 #include "core/frame/DOMWindow.h"
 #include "core/frame/RemoteFrame.h"
 
@@ skipping 36 matching lines @@
     String status() const override;
     void setStatus(const String&) override;
     String defaultStatus() const override;
     void setDefaultStatus(const String&) override;
     Document* document() const override;
     StyleMedia* styleMedia() const override;
     double devicePixelRatio() const override;
     ApplicationCache* applicationCache() const override;
     int orientation() const override;
     Console* console() const override;
-    DOMWindowCSS* css() const override;
     DOMSelection* getSelection() override;
     void focus(ExecutionContext* = 0) override;
     void blur() override;
     void close(ExecutionContext* = 0) override;
     void print() override;
     void stop() override;
     void alert(const String& message = String()) override;
     bool confirm(const String& message) override;
     String prompt(const String& message, const String& defaultValue) override;
     bool find(const String&, bool caseSensitive, bool backwards, bool wrap, bool wholeWord, bool searchInFrames, bool showDialog) const override;
@@ skipping 14 matching lines @@
 
 private:
     explicit RemoteDOMWindow(RemoteFrame&);
 
     RawPtrWillBeMember<RemoteFrame> m_frame;
 };
 
 } // namespace blink
 
 #endif // DOMWindow_h