Run RemoveArcData after a user has opted out

components/arc/DEPS

Index: components/arc/DEPS
diff --git a/components/arc/DEPS b/components/arc/DEPS
index e6d16e4fac440dc664be9587672cd88d6bf3d46d..988352de369223ca74271ba11727dd141021c4be 100644
--- a/components/arc/DEPS
+++ b/components/arc/DEPS
@@ -1,10 +1,12 @@
 include_rules = [
+  "+chrome/common",

[Daniel Erat, 2016/05/18 00:31:26]

i'm not sure that this is permitted. i don't see any existing dependencies on
chrome/ in components/*/DEPS right now.

given the amount of arc code that lives outside of chrome/, there's probably
some other way to check if it's enabled without looking at a chrome pref, right?

[dspaid, 2016/05/18 00:41:43]

I was worried about that, and it was one of the reasons that I originally had
this in chrome/browser/chromeos/arc... As far as I can tell there's no way to
get the arc enabled state outside of looking at the user preferences. 
Presumably I could also pass the preference key along with the PrefService
pointer (or pass a callback to specifically get the kArcEnabled preference), but
both seem pretty hacky.

[Daniel Erat, 2016/05/18 00:58:27]

how will the pref be updated, and is it used by anything else? i only see
mentions to it in ArcAuthService in my checkout.

do you expect the opt-out state to be needed by other code in components/arc in
the future? if so, it seems like it'd be cleaner to pass the opt-out state into
some more-central place in the component where it can be distributed to
everything that needs it. that'll probably make testing easier as well.

[Luis Héctor Chávez, 2016/05/19 16:10:27]

chrome/ is definitely not permitted from components :( If you can't inject the
dependency, maybe you need to move the code to chrome/browser/chromeos/arc.

[dspaid, 2016/05/20 07:27:07]

Done.

   "+chromeos/arc",
   "+chromeos/chromeos_switches.h",
   "+chromeos/dbus",
   "+components/exo",
   "+components/prefs",
   "+components/signin/core/account_id",
+  "+components/user_manager",
   "+ipc",
   "+mojo",
   "+third_party/re2",