Remove registration in toolbar_view.cc for unused notification.

This was causing a DCHECK as ToolbarView::Observe both didn't handle the
asked-for notification and DCHECKed on unhandled notification types.

BUG=407124
TEST=NONE

Review URL: https://codereview.chromium.org/503783002

Cr-Commit-Position: refs/heads/master@{#291823}

chrome/browser/ui/views/toolbar/toolbar_view.cc

@@ -155,8 +155,6 @@ ToolbarView::ToolbarView(Browser* browser)
       (browser->is_app() && IsStreamlinedHostedAppsEnabled()))
     display_mode_ = DISPLAYMODE_NORMAL;
 
-  registrar_.Add(this, chrome::NOTIFICATION_UPGRADE_RECOMMENDED,
-                 content::NotificationService::AllSources());
   if (OutdatedUpgradeBubbleView::IsAvailable()) {
     registrar_.Add(this, chrome::NOTIFICATION_OUTDATED_INSTALL,
                    content::NotificationService::AllSources());