Check that we have a focus manager in aura before trying to set focus.

chrome/browser/ui/views/tab_contents/native_tab_contents_container_aura.cc

 // Copyright (c) 2011 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 "chrome/browser/ui/views/tab_contents/native_tab_contents_container_aura.h"
 
 #include "chrome/browser/ui/view_ids.h"
 #include "chrome/browser/ui/views/tab_contents/tab_contents_container.h"
 #include "chrome/browser/ui/views/tab_contents/tab_contents_view_views.h"
 #include "content/browser/tab_contents/interstitial_page.h"
@@ skipping 95 matching lines @@
 }
 
 void NativeTabContentsContainerAura::RequestFocus() {
   // This is a hack to circumvent the fact that a the OnFocus() method is not
   // invoked when RequestFocus() is called on an already focused view.
   // The TabContentsContainer is the view focused when the TabContents has
   // focus.  When switching between from one tab that has focus to another tab
   // that should also have focus, RequestFocus() is invoked one the
   // TabContentsContainer.  In order to make sure OnFocus() is invoked we need
   // to clear the focus before hands.
-  {
+  if (GetFocusManager()) {
     // Disable notifications.  Clear focus will assign the focus to the main
     // browser window.  Because this change of focus was not user requested,
     // don't send it to listeners.
     views::AutoNativeNotificationDisabler local_notification_disabler;
     GetFocusManager()->ClearFocus();
   }
   View::RequestFocus();
 }
 
 void NativeTabContentsContainerAura::AboutToRequestFocusFromTabTraversal(
@@ skipping 14 matching lines @@
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeTabContentsContainer, public:
 
 // static
 NativeTabContentsContainer* NativeTabContentsContainer::CreateNativeContainer(
     TabContentsContainer* container) {
   return new NativeTabContentsContainerAura(container);
 }