Give up focus if the focused view becomes unfocusable

ui/message_center/views/message_view.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/message_center/views/message_view.h"
 
 #include "grit/ui_resources.h"
 #include "grit/ui_strings.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/base/l10n/l10n_util.h"
@@ skipping 141 matching lines @@
       gfx::Rect(point, gfx::Size()),
       views::MenuItemView::TOPRIGHT,
       source_type,
       views::MenuRunner::HAS_MNEMONICS));
 }
 
 MessageView::MessageView(const string16& display_source)
     : context_menu_controller_(
         new MessageViewContextMenuController(this, display_source)),
       scroller_(NULL) {
-  set_focusable(true);
+  SetFocusable(true);
   set_context_menu_controller(context_menu_controller_.get());
 
   PaddedButton *close = new PaddedButton(this);
   close->SetPadding(-kCloseIconRightPadding, kCloseIconTopPadding);
   close->SetNormalImage(IDR_NOTIFICATION_CLOSE);
   close->SetHoveredImage(IDR_NOTIFICATION_CLOSE_HOVER);
   close->SetPressedImage(IDR_NOTIFICATION_CLOSE_PRESSED);
   close->set_owned_by_client();
   close->set_animate_on_state_change(false);
   close->SetAccessibleName(l10n_util::GetStringUTF16(
@@ skipping 113 matching lines @@
   if (sender == close_button()) {
     RemoveNotification(true);  // By user.
   }
 }
 
 void MessageView::OnSlideOut() {
   RemoveNotification(true);  // By user.
 }
 
 }  // namespace message_center