Attempt 2 at: Fixes crash that occured because NativeViewHostAura::Detach was not

ui/views/controls/native/native_view_host_win.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_VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_WIN_H_
 #define UI_VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_WIN_H_
 
 #include "base/basictypes.h"
 #include "ui/views/controls/native/native_view_host_wrapper.h"
 
@@ skipping 14 matching lines @@
   virtual void RemovedFromWidget();
   virtual void InstallClip(int x, int y, int w, int h);
   virtual bool HasInstalledClip();
   virtual void UninstallClip();
   virtual void ShowWidget(int x, int y, int w, int h);
   virtual void HideWidget();
   virtual void SetFocus();
   virtual gfx::NativeViewAccessible GetNativeViewAccessible();
 
  private:
-  // Invokes ViewRemoved() on the FocusManager for all the child Widgets of our
-  // NativeView. This is used when detaching to ensure the FocusManager doesn't
-  // have a reference to a View that is no longer reachable.
-  void ClearFocus();
-
   // Our associated NativeViewHost.
   NativeViewHost* host_;
 
   // Have we installed a region on the gfx::NativeView used to clip to only the
   // visible portion of the gfx::NativeView ?
   bool installed_clip_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewHostWin);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_NATIVE_NATIVE_VIEW_HOST_WIN_H_