Revert r21117 as it caused reliability failures....

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 <queue>
 #include <vector>
@@ skipping 342 matching lines @@
   void InsertCSS(const std::wstring& frame_xpath,
                  const std::string& css);
 
   int delay_seconds_for_form_state_sync() const {
     return delay_seconds_for_form_state_sync_;
   }
   void set_delay_seconds_for_form_state_sync(int delay_in_seconds) {
     delay_seconds_for_form_state_sync_ = delay_in_seconds;
   }
 
+  // Returns a message loop of type IO that can be used to run I/O jobs. The
+  // renderer thread is of type TYPE_DEFAULT, so doesn't support everything
+  // needed by some consumers. The returned thread will be the main thread of
+  // the renderer, which processes all IPC, to any I/O should be non-blocking.
+  MessageLoop* GetMessageLoopForIO();
+
   AudioMessageFilter* audio_message_filter() { return audio_message_filter_; }
 
   void OnClearFocusedNode();
 
   void SendExtensionRequest(const std::string& name, const std::string& args,
                             int request_id, bool has_callback);
   void OnExtensionResponse(int request_id, bool success,
                            const std::string& response,
                            const std::string& error);
 
@@ skipping 426 matching lines @@
   // PrintWebViewHelper handles printing.  Note that this object is constructed
   // when printing for the first time but only destroyed with the RenderView.
   scoped_ptr<PrintWebViewHelper> print_helper_;
 
   RendererPreferences renderer_preferences_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderView);
 };
 
 #endif  // CHROME_RENDERER_RENDER_VIEW_H_