Destroy tooltip manager if the native window is destroyed.

views/widget/tooltip_manager_views.cc

Index: views/widget/tooltip_manager_views.cc
diff --git a/views/widget/tooltip_manager_views.cc b/views/widget/tooltip_manager_views.cc
index a7d367bf487ba0f22d0ce8c98c1b24d70655db58..a8b6d975d8852898a715d07d465747265714acae 100644
--- a/views/widget/tooltip_manager_views.cc
+++ b/views/widget/tooltip_manager_views.cc
@@ -75,8 +75,7 @@ int TooltipManager::GetMaxWidth(int x, int y) {
 
 TooltipManagerViews::TooltipManagerViews(views::View* root_view)
     : root_view_(root_view),
-      tooltip_view_(NULL),
-      widget_closed_(false) {
+      tooltip_view_(NULL) {
   tooltip_label_.set_background(
       views::Background::CreateSolidBackground(kTooltipBackground));
   tooltip_widget_.reset(CreateTooltip());
@@ -87,7 +86,6 @@ TooltipManagerViews::TooltipManagerViews(views::View* root_view)
       base::TimeDelta::FromMilliseconds(kTooltipTimeoutMs),
       this, &TooltipManagerViews::TooltipTimerFired);
   MessageLoopForUI::current()->AddObserver(this);
-  root_view_->GetWidget()->AddObserver(this);
 }
 
 TooltipManagerViews::~TooltipManagerViews() {
@@ -152,11 +150,6 @@ void TooltipManagerViews::DidProcessEvent(const base::NativeEvent& event) {
 }
 #endif
 
-void TooltipManagerViews::OnWidgetClosing(Widget* widget) {
-  tooltip_timer_.Stop();
-  widget_closed_ = true;
-}
-
 void TooltipManagerViews::TooltipTimerFired() {
   UpdateIfRequired(curr_mouse_pos_.x(), curr_mouse_pos_.y(), false);
 }
@@ -179,9 +172,6 @@ View* TooltipManagerViews::GetViewForTooltip(int x, int y, bool for_keyboard) {
 }
 
 void TooltipManagerViews::UpdateIfRequired(int x, int y, bool for_keyboard) {
-  if (widget_closed_)
-    return;
-
   View* view = GetViewForTooltip(x, y, for_keyboard);
   string16 tooltip_text;
   if (view)