Add warning message when disabling ARC.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <!-- Idle logout dialog for retail mode -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog. Used in retail mode only.">
     Are you still there?
   </message>
@@ skipping 6585 matching lines @@
   </message>
   <message name="IDS_ARC_OPT_IN_DIALOG_METRICS_MANAGED_DISABLED" desc="Message in the opt-in dialog for Android apps in case metrics are enabled on the device and off.">
     Your administrator may choose to send diagnostic and usage data for this device to Google. You may view this <ph name="BEGIN_LINK1">&lt;a href="#" id="settings-link"&gt;</ph>setting<ph name="END_LINK1">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph> here. <ph name="BEGIN_LINK2">&lt;a href="#" id="learn-more-link"&gt;</ph>Learn More<ph name="END_LINK2">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>
   </message>
   <message name="IDS_ARC_OPT_IN_DIALOG_METRICS_ENABLED" desc="Message in the opt-in dialog for Android apps in case metrics are already enabled on the device. User has no way to deactivate them using opt-in dialog.">
     This device will automatically send diagnostic and usage data to Google. You can change this at any time in your device <ph name="BEGIN_LINK1">&lt;a href="#" id="settings-link"&gt;</ph>settings<ph name="END_LINK1">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>. <ph name="BEGIN_LINK2">&lt;a href="#" id="learn-more-link"&gt;</ph>Learn More<ph name="END_LINK2">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>
   </message>
   <message name="IDS_ARC_OPT_IN_DIALOG_METRICS_DISABLED" desc="Message in the opt-in dialog for Android apps in case metrics are disabled on the device. User has an option to active them using opt-in dialog">
     Automatically send diagnostic and usage data to Google. You can change this at any time in your device <ph name="BEGIN_LINK1">&lt;a href="#" id="settings-link"&gt;</ph>settings<ph name="END_LINK1">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>. <ph name="BEGIN_LINK2">&lt;a href="#" id="learn-more-link"&gt;</ph>Learn More<ph name="END_LINK2">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>
   </message>
+  <message name="IDS_ARC_OPT_OUT_TAB_TITLE" desc="Tab title when viewing opt-out setting dialog for android apps.">
+    Settings - Remove Google Play Store
+  </message>
+  <message name="IDS_ARC_OPT_OUT_DIALOG_HEADER" desc="Title of the opt-out dialog for android apps.">
+    Remove Google Play Store?
+  </message>
+  <message name="IDS_ARC_OPT_OUT_DIALOG_DESCRIPTION" desc="Describes what will happen if the user opts out of android apps">
+    Apps you've downloaded from the Play Store, along with all app data, will be deleted from this Chromebook. This cannot be undone. This doesn't affect apps from the Play Store on your Android devices and other Chromebooks.

[stevenjb, 2016/06/08 00:41:42]

You might want to run this by UX, but I believe we generally avoid the use of
"you". I would just remove it, i.e. "Apps downloaded from the Play Store"

+  </message>
+  <message name="IDS_ARC_OPT_OUT_DIALOG_BUTTON_CONFIRM_DISABLE" desc="Button to confirm that play store should be removed from this device">
+    Remove Play Store
+  </message>
+  <message name="IDS_ARC_OPT_OUT_DIALOG_BUTTON_CANCEL" desc="Button to cancel the removal of the play store from this device">
+    Cancel
+  </message>
   <message name="IDS_ARC_SIGN_IN_NETWORK_ERROR" desc="Android sign-in error because of network error">
     Network error
   </message>
   <message name="IDS_ARC_SIGN_IN_SERVICE_UNAVAILABLE_ERROR" desc="Android sign-in error because of service is unavailable">
     Service unavailable
   </message>
   <message name="IDS_ARC_SIGN_IN_BAD_AUTHENTICATION_ERROR" desc="Android sign-in error because of bad authentification">
     Bad authentication
   </message>
   <message name="IDS_ARC_SIGN_IN_GMS_NOT_AVAILABLE_ERROR" desc="Android sign-in error because of GMS services are unavailable">
@@ skipping 11 matching lines @@
   <message name="IDS_ARC_ANDROID_MANAGEMENT_REQUIRED_ERROR" desc="Error message shown when Android management is required for an unmanaged Chrome OS user.">
     Your organization has not enabled Android Apps for your account. Contact your administrator for more information.
   </message>
   <message name="IDS_FLAGS_ENABLE_IME_MENU_NAME" desc="Name of the about: flag for enabling opt-in IME menu.">
     Enable opt-in IME menu
     </message>
   <message name="IDS_FLAGS_ENABLE_IME_MENU_DESCRIPTION" desc="Description of the about: flag for enabling opt-in IME menu.">
     Enable access to the new IME menu in the Language Settings page.
   </message>
 </grit-part>