Copy text selection from renderer to browser every time it changes.

chrome/renderer/render_view.h

 // Copyright (c) 2009 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 CHROME_RENDERER_RENDER_VIEW_H_
 #define CHROME_RENDERER_RENDER_VIEW_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 817 matching lines @@
   // browser process with every little thing that changes. This normally doesn't
   // change but is overridden by tests.
   int delay_seconds_for_form_state_sync_;
 
   // A set of audio renderers registered to use IPC for audio output.
   IDMap<AudioRendererImpl> audio_renderers_;
 
   // Maps pending callback IDs to their frames.
   IDMap<WebFrame> pending_extension_callbacks_;
 
-  // The currently selected text. This is currently only updated on Linux, where
-  // it's for the selection clipboard.
-  std::string selection_text_;
-
   DISALLOW_COPY_AND_ASSIGN(RenderView);
 };
 
 #endif  // CHROME_RENDERER_RENDER_VIEW_H_