aura: Fix crash in RootWindowHostX11::GetXImage().

ui/aura/root_window_host_x11.h

 // Copyright (c) 2012 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 UI_AURA_ROOT_WINDOW_HOST_X11_H_
 #define UI_AURA_ROOT_WINDOW_HOST_X11_H_
 
 #include <X11/Xlib.h>
 
 #include <vector>
@@ skipping 78 matching lines @@
   bool IsWindowManagerPresent();
 
   // Sets the cursor on |xwindow_| to |cursor|.  Does not check or update
   // |current_cursor_|.
   void SetCursorInternal(gfx::NativeCursor cursor);
 
   // Translates the native mouse location into screen coordinates and and
   // dispatches the event to RootWindowHostDelegate.
   void TranslateAndDispatchMouseEvent(ui::MouseEvent* event);
 
-  // Copies and returns |snapshot_bounds| from |xwindow_|.  Helper method for
-  // CopyAreaToSkCanvas() and GrabSnapshot().
-  scoped_ptr<ui::XScopedImage> GetXImage(const gfx::Rect& snapshot_bounds);
-
   // Update is_internal_display_ based on delegate_ state
   void UpdateIsInternalDisplay();
 
   // Set the CrOS touchpad "tap paused" property. It is used to temporarily
   // turn off the Tap-to-click feature when the mouse pointer is invisible.
   void SetCrOSTapPaused(bool state);
 
   RootWindowHostDelegate* delegate_;
 
   // The display and the native X window hosting the root window.
@@ skipping 38 matching lines @@
 namespace test {
 
 // Set the default value of the override redirect flag used to
 // create a X window for RootWindowHostX11.
 AURA_EXPORT void SetUseOverrideRedirectWindowByDefault(bool override_redirect);
 
 }  // namespace test
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_HOST_X11_H_