Remove explicit initialization of notification_ui_manager().

Bug: 578868
Change-Id: I557cc7c90b9632beae9e7b56ca477515abcd67ab
Reviewed-on: https://chromium-review.googlesource.com/896705Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534107}

chrome/browser/chrome_browser_main.cc

@@ -2042,12 +2042,6 @@ int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
 
   PreBrowserStart();
 
-  // Instantiate the notification UI manager, as this triggers a perf timer
-  // used to measure startup time. TODO(stevenjb): Figure out what is actually
-  // triggering the timer and call that explicitly in the approprate place.
-  // http://crbug.com/105065.
-  browser_process_->notification_ui_manager();
-
   if (!parsed_command_line().HasSwitch(switches::kDisableComponentUpdate))
     RegisterComponentsForUpdate(profile_->GetPrefs());