Fix missing backing store in Linux.

chrome/browser/tab_contents/web_contents_view_gtk.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_BROWSER_TAB_CONTENTS_WEB_CONTENTS_VIEW_GTK_H_
 #define CHROME_BROWSER_TAB_CONTENTS_WEB_CONTENTS_VIEW_GTK_H_
 
 #include "base/scoped_ptr.h"
 #include "chrome/browser/tab_contents/web_contents_view.h"
 #include "chrome/common/owned_widget_gtk.h"
@@ skipping 24 matching lines @@
   virtual void SizeContents(const gfx::Size& size);
   virtual void FindInPage(const Browser& browser,
                           bool find_next, bool forward_direction);
   virtual void HideFindBar(bool end_session);
   virtual void ReparentFindWindow(Browser* new_browser) const;
   virtual bool GetFindBarWindowInfo(gfx::Point* position,
                                     bool* fully_visible) const;
   virtual void SetInitialFocus();
   virtual void StoreFocus();
   virtual void RestoreFocus();
+  virtual void SetChildSize(RenderWidgetHostView* rwh_view);
 
   // Backend implementation of RenderViewHostDelegate::View.
   virtual void ShowContextMenu(const ContextMenuParams& params);
   virtual void StartDragging(const WebDropData& drop_data);
   virtual void UpdateDragCursor(bool is_drop_target);
   virtual void TakeFocus(bool reverse);
   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event);
   virtual void OnFindReply(int request_id,
                            int number_of_matches,
                            const gfx::Rect& selection_rect,
                            int active_match_ordinal,
                            bool final_update);
+
  private:
   // We keep track of the timestamp of the latest mousedown event.
   static gboolean OnMouseDown(GtkWidget* widget,
                               GdkEventButton* event, WebContentsViewGtk* view);
 
   // The native widget for the tab.
   OwnedWidgetGtk vbox_;
 
   // The native widget for the contents of the tab. We do not own this widget.
   GtkWidget* content_view_;
 
   // The context menu is reset every time we show it, but we keep a pointer to
   // between uses so that it won't go out of scope before we're done with it.
   scoped_ptr<RenderViewContextMenuGtk> context_menu_;
 
   // The event time for the last mouse down we handled. We need this to properly
   // show context menus.
   guint32 last_mouse_down_time_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewGtk);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_WEB_CONTENTS_VIEW_GTK_H_