Destroy tooltip manager if the native window is destroyed.

views/widget/native_widget_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 "views/widget/native_widget_aura.h"
 
 #include "base/bind.h"
 #include "ui/aura/desktop.h"
 #include "ui/aura/event.h"
 #include "ui/aura/window.h"
@@ skipping 517 matching lines @@
 void NativeWidgetAura::OnCaptureLost() {
   delegate_->OnMouseCaptureLost();
 }
 
 void NativeWidgetAura::OnPaint(gfx::Canvas* canvas) {
   delegate_->OnNativeWidgetPaint(canvas);
 }
 
 void NativeWidgetAura::OnWindowDestroying() {
   delegate_->OnNativeWidgetDestroying();
+
+  // If the aura::Window is destroyed, we can no longer show tooltips.
+  tooltip_manager_.reset();
 }
 
 void NativeWidgetAura::OnWindowDestroyed() {
   window_ = NULL;
   delegate_->OnNativeWidgetDestroyed();
   if (ownership_ == Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET)
     delete this;
 }
 
 void NativeWidgetAura::OnWindowVisibilityChanged(bool visible) {
@@ skipping 86 matching lines @@
 }
 
 // static
 bool NativeWidgetPrivate::IsMouseButtonDown() {
   NOTIMPLEMENTED();
   return false;
 }
 
 }  // namespace internal
 }  // namespace views