Update two chromeos system dialogs to reuse more DialogDelegateView

chrome/app/chromeos_strings.grdp

Index: chrome/app/chromeos_strings.grdp
diff --git a/chrome/app/chromeos_strings.grdp b/chrome/app/chromeos_strings.grdp
index 06e2d4315e2d4cb868d02dc58061fc36f10702db..e2186ad91c56f5db46c963a7993b07c15691c230 100644
--- a/chrome/app/chromeos_strings.grdp
+++ b/chrome/app/chromeos_strings.grdp
@@ -5593,9 +5593,10 @@ Battery full
   </message>
   <message name="IDS_MULTIPROFILES_INTRO_MESSAGE" desc="Content of the multi-profiles intro dialog shown when the user adds another user in multi-profiles mode.">
     This feature allows you to access quickly any signed-in user without requiring a password.

[Daniel Erat, 2016/10/21 22:00:39]

"to access quickly any signed-in user" <-- yay awkward phrasing to avoid split
infinitive :-P

[Evan Stade, 2016/10/21 22:17:42]

I'm going to fix this because "to quickly access..." sounds 10x more fluent than
"to access quickly...", and because Star Trek is a better model to follow than
Strunk and White.

+
+Only use this feature with accounts you trust.
   </message>
   <message name="IDS_MULTIPROFILES_INTRO_EXPLANATION" desc="Content of the multi-profiles intro dialog shown when the user adds another user in multi-profiles mode.">

[Daniel Erat, 2016/10/21 22:00:39]

i think that this is unused now and can be deleted.

[Evan Stade, 2016/10/21 22:17:42]

done

-    Only use this feature with accounts you trust.
   </message>
   <message name="IDS_MULTIPROFILES_INTRO_NOSHOW_AGAIN" desc="In multi-profiles intro dialog, text for no-show-again option.">
     Got it, don't show me this again.