Removed NOTIFICATION_BROWSER_CLOSING notification

chrome/browser/ui/browser.cc

Index: chrome/browser/ui/browser.cc
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index 832153b86e17201770479a2f4bfa17284c823b52..8c13ca4f13ad81a56d1fbafaebd620874e951392 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -746,6 +746,8 @@ void Browser::OnWindowClosing() {
   if (tab_restore_service && is_type_tabbed() && tab_strip_model_->count())
     tab_restore_service->BrowserClosing(live_tab_context());
 
+  BrowserList::NotifyBrowserWindowClosing(this);
+
   // TODO(sky): convert session/tab restore to use notification.
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_BROWSER_CLOSING,
@@ -2556,7 +2558,10 @@ bool Browser::ShouldHideUIForFullscreen() const {
 }
 
 bool Browser::ShouldStartShutdown() const {
-  return BrowserList::GetInstance()->size() <= 1;
+  DCHECK_GE(BrowserList::GetInstance()->size(),
+            BrowserList::GetInstance()->currently_closing_browsers_count());
+  return (BrowserList::GetInstance()->size() -
+          BrowserList::GetInstance()->currently_closing_browsers_count()) <= 1;

[sky, 2017/03/31 14:23:41]

Why do you need the <= 1? Shouldn't it be size() + 1 ==
currently_closing_browsers_count(), with a description as to why the + 1?

[Alexey Seren, 2017/04/02 12:02:35]

Yes you are right. Equality checking will allow to start shutdown process only
once (because Browser::OnWindowClosing is called several times).

Hope this comment will be clear:
// Start shutdown process only when closing the last window.

 }
 
 bool Browser::MaybeCreateBackgroundContents(