It is time.

ui/wm/public/scoped_tooltip_disabler.cc

-// Copyright 2014 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/wm/public/scoped_tooltip_disabler.h"
-
-#include "ui/aura/window.h"
-#include "ui/wm/public/tooltip_client.h"
-
-namespace aura {
-namespace client {
-
-ScopedTooltipDisabler::ScopedTooltipDisabler(aura::Window* window)
-    : root_(window ? window->GetRootWindow() : NULL) {
-  if (root_) {
-    root_->AddObserver(this);
-    TooltipClient* client = GetTooltipClient(root_);
-    if (client)
-      client->SetTooltipsEnabled(false);
-  }
-}
-
-ScopedTooltipDisabler::~ScopedTooltipDisabler() {
-  EnableTooltips();
-}
-
-void ScopedTooltipDisabler::EnableTooltips() {
-  if (!root_)
-    return;
-  TooltipClient* client = GetTooltipClient(root_);
-  if (client)
-    client->SetTooltipsEnabled(true);
-  root_->RemoveObserver(this);
-  root_ = NULL;
-}
-
-void ScopedTooltipDisabler::OnWindowDestroying(aura::Window* window) {
-  EnableTooltips();
-}
-
-
-}  // namespace client
-}  // namespace aura