Give up focus if the focused view becomes unfocusable

ash/system/tray/actionable_view.cc

 // Copyright 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 "ash/system/tray/actionable_view.h"
 
 #include "ash/ash_constants.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/gfx/canvas.h"
 
 namespace ash {
 namespace internal {
 
 // static
 const char ActionableView::kViewClassName[] = "tray/ActionableView";
 
 ActionableView::ActionableView()
     : has_capture_(false) {
-  set_focusable(true);
+  SetFocusable(true);
 }
 
 ActionableView::~ActionableView() {
 }
 
 void ActionableView::OnPaintFocus(gfx::Canvas* canvas) {
   gfx::Rect rect(GetFocusBounds());
   rect.Inset(1, 1, 3, 2);
   canvas->DrawSolidFocusRect(rect, kFocusBorderColor);
 }
@@ skipping 56 matching lines @@
   SchedulePaint();
 }
 
 void ActionableView::OnGestureEvent(ui::GestureEvent* event) {
   if (event->type() == ui::ET_GESTURE_TAP && PerformAction(*event))
     event->SetHandled();
 }
 
 }  // namespace internal
 }  // namespace ash