Delete NOTIFICATION_TAB_PARENTED and NOTIFICATION_TAB_CLOSING.

Recent changes have removed their usage throughout the codebase.

Bug: 268984
Change-Id: Ie45823b4bb5276bf497ff68124163b81c938c09f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1756388Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#687403}

chrome/browser/chrome_notification_types.h

@@ -88,21 +88,6 @@ enum NotificationType {
   // handler.  Use APP_TERMINATING for such needs.
   NOTIFICATION_CLOSE_ALL_BROWSERS_REQUEST,
 
-  // Tabs --------------------------------------------------------------------
-
-  // This notification is sent after a tab has been appended to the tab_strip.
-  // The source is a Source<WebContents> of the tab being added. There
-  // are no details.
-  NOTIFICATION_TAB_PARENTED,
-
-  // This message is sent before a tab has been closed.  The source is a
-  // Source<NavigationController> with a pointer to the controller for the
-  // closed tab.  No details are expected.
-  //
-  // See also content::NOTIFICATION_WEB_CONTENTS_DESTROYED, which is sent when
-  // the WebContents containing the NavigationController is destroyed.
-  NOTIFICATION_TAB_CLOSING,
-
   // Authentication ----------------------------------------------------------
 
   // This is sent when a login prompt is shown.  The source is the

chrome/browser/ui/browser.cc

@@ -2069,11 +2069,6 @@ void Browser::OnTabInsertedAt(WebContents* contents, int index) {
 
   SessionTabHelper::FromWebContents(contents)->SetWindowID(session_id());
 
-  content::NotificationService::current()->Notify(
-      chrome::NOTIFICATION_TAB_PARENTED,
-      content::Source<content::WebContents>(contents),
-      content::NotificationService::NoDetails());
-
   SyncHistoryWithTabs(index);
 
   // Make sure the loading state is updated correctly, otherwise the throbber
@@ -2112,10 +2107,7 @@ void Browser::OnTabClosing(WebContents* contents) {
       SessionServiceFactory::GetForProfile(profile_);
   if (session_service)
     session_service->TabClosing(contents);
-  content::NotificationService::current()->Notify(
-      chrome::NOTIFICATION_TAB_CLOSING,
-      content::Source<NavigationController>(&contents->GetController()),
-      content::NotificationService::NoDetails());
+
   SearchTabHelper::FromWebContents(contents)->OnTabClosing();
 }