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

ui/views/controls/native/native_view_host.cc

 // 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.
 
 #include "ui/views/controls/native/native_view_host.h"
 
 #include "base/logging.h"
 #include "ui/gfx/canvas.h"
 #include "ui/views/controls/native/native_view_host_wrapper.h"
 #include "ui/views/widget/widget.h"
@@ skipping 163 matching lines @@
   }
 
   return View::GetNativeViewAccessible();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeViewHost, private:
 
 void NativeViewHost::Detach(bool destroyed) {
   if (native_view_) {
+    if (!destroyed)
+      ClearFocus();
     native_wrapper_->NativeViewDetaching(destroyed);
     native_view_ = NULL;
   }
 }
 
+void NativeViewHost::ClearFocus() {
+  FocusManager* focus_manager = GetFocusManager();
+  if (!focus_manager || !focus_manager->GetFocusedView())
+    return;
+
+  Widget::Widgets widgets;
+  Widget::GetAllChildWidgets(native_view(), &widgets);
+  for (Widget::Widgets::iterator i = widgets.begin(); i != widgets.end(); ++i) {
+    focus_manager->ViewRemoved((*i)->GetRootView());
+    if (!focus_manager->GetFocusedView())
+      return;
+  }
+}
+
+
 }  // namespace views