Disable ACTION_BOOT_COMPLETED event for 3rd party apps.

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 6296 matching lines @@
   </message>
   <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 Google Play Store for your account. Contact your administrator for more information.
   </message>
   <message name="IDS_ARC_CRITICALLY_LOW_DISK_NOTIFICATION_TITLE" desc="Title of the notification warning users that they are critically low on disk space and Android apps can not be launched.">
     Device disk space critically low
   </message>
   <message name="IDS_ARC_CRITICALLY_LOW_DISK_NOTIFICATION_MESSAGE" desc="Notification text warning users that they are critically low on disk space and Android apps can not be launched.">
     Free up disk space to launch Android apps.
   </message>
+  <message name="IDS_FLAGS_ARC_BOOT_COMPLETED" desc="Name of the flag for blocking the ACTION_BOOT_COMPLETED broadcast for third-party apps on ARC.">
+    Load Android apps automatically
+  </message>
+  <message name="IDS_FLAGS_ARC_BOOT_COMPLETED_DESCRIPTION" desc="Description for the flag for blocking ACTION_BOOT_COMPLETED broadcast for third-party apps.">
+    Allow Android apps to start automatically after signing in.
+  </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>
   <message name="IDS_LOW_DISK_NOTIFICATION_TITLE" desc="Title of the notification warning users that they are low on disk space.">
     Device is low on disk space
   </message>
   <message name="IDS_LOW_DISK_NOTIFICATION_MESSAGE" desc="Notification text warning users that they are low on disk space.">
@@ skipping 11 matching lines @@
   <message name="IDS_FLAGS_ENABLE_EHV_INPUT_NAME" desc="Name of the about: flag for enabling emoji, handwriting and voice input on opt-in IME menu.">
     Emoji, handwriting and voice input on opt-in IME menu
     </message>
   <message name="IDS_FLAGS_ENABLE_EHV_INPUT_DESCRIPTION" desc="Description of the about: flag enabling emoji, handwriting and voice input on opt-in IME menu.">
     Enable access to emoji, handwriting and voice input form opt-in IME menu.
   </message>
   <message name="IDS_HATS_DONE_BUTTON_LABEL" desc="Label used for the done button at the end of survey">
     Done
   </message>
 </grit-part>