Move clipboard-related webkit_glue embedder functions into a ClipboardClient interface.

webkit/glue/scoped_clipboard_writer_glue.h

 // Copyright (c) 2011 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 WEBKIT_GLUE_SCOPED_CLIPBOARD_WRITER_GLUE_H_
 #define WEBKIT_GLUE_SCOPED_CLIPBOARD_WRITER_GLUE_H_
 
 #include "ui/base/clipboard/scoped_clipboard_writer.h"
-
-namespace base {
-class SharedMemory;
-}
+#include "webkit/glue/clipboard_client.h"
 
 class ScopedClipboardWriterGlue : public ui::ScopedClipboardWriter {
  public:
-  explicit ScopedClipboardWriterGlue(ui::Clipboard* clipboard)
-      : ui::ScopedClipboardWriter(clipboard),
-        shared_buf_(NULL) {
-  }
+  explicit ScopedClipboardWriterGlue(webkit_glue::ClipboardClient* client);
 
   ~ScopedClipboardWriterGlue();
 
   void WriteBitmapFromPixels(const void* pixels, const gfx::Size& size);
 
  private:
-  base::SharedMemory* shared_buf_;
+  webkit_glue::ClipboardClient::WriteContext* context_;
   DISALLOW_COPY_AND_ASSIGN(ScopedClipboardWriterGlue);
 };
 
 #endif  // WEBKIT_GLUE_SCOPED_CLIPBOARD_WRITER_GLUE_H_