chromeos: update bug id in chrome/browser/ui/ash/chrome_shell_delegate.cc

BUG=705713
TEST=none

Change-Id: Ic8679c208d015e5019684e581e520b343bf411e1
Reviewed-on: https://chromium-review.googlesource.com/1176107Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583366}

chrome/browser/ui/ash/chrome_shell_delegate.cc

@@ -94,7 +94,7 @@ bool ChromeShellDelegate::CanShowWindowForUser(aura::Window* window) const {
 }
 
 void ChromeShellDelegate::PreInit() {
-  // TODO: port to mash. http://crbug.com/678949.
+  // TODO: port to multi-process mash. http://crbug.com/705713.
   if (!features::IsAshInBrowserProcess())
     return;