OOBE: Improve forced autoupdate message

Bug: 922689
Change-Id: I44e7b3df06cbd522076a65caeee288fd494afb71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1820577Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699364}

chrome/app/chromium_strings.grd

@@ -1137,10 +1137,10 @@ Signing in anyway will merge Chromium information like bookmarks, history, and o
           Please wait while Chromium installs the latest system updates.
         </message>
         <message name="IDS_CHECKING_FOR_UPDATE_MSG" desc="Chrome OS OOBE: message shown during checking for update stage.">
-          Chromium updates automatically so you always have the freshest version.
+          Future versions of Chromium will install automatically.
         </message>
         <message name="IDS_UPDATE_MSG" desc="Chrome OS OOBE: message shown during update stage.">
-          Chromium updates automatically so you always have the freshest version. When this download completes, Chromium will restart and you'll be on your way.
+          Future versions of Chromium will install automatically. When this download completes, Chromium will restart and you'll be on your way.
         </message>
         <message name="IDS_EULA_SCREEN_ACCESSIBLE_TITLE" desc="Title to be spoken on opening the OOBE EULA screen">
           Chromium OS terms

chrome/app/google_chrome_strings.grd

@@ -1156,10 +1156,10 @@ Signing in anyway will merge Chrome information like bookmarks, history, and oth
           Please wait while Chrome installs the latest system updates.
         </message>
         <message name="IDS_CHECKING_FOR_UPDATE_MSG" desc="Chrome OS OOBE: message shown during checking for update stage.">
-          Chrome updates automatically so you always have the freshest version.
+          Future versions of Chrome will install automatically.
         </message>
         <message name="IDS_UPDATE_MSG" desc="Chrome OS OOBE: message shown during update stage.">
-          Chrome updates automatically so you always have the freshest version. When this download completes, Chrome will restart and you'll be on your way.
+          Future versions of Chrome will install automatically. When this download completes, Chrome will restart and you'll be on your way.
         </message>
         <message name="IDS_EULA_SCREEN_ACCESSIBLE_TITLE" desc="Title to be spoken on opening the OOBE EULA screen">
           Chrome OS terms

chrome/browser/resources/chromeos/login/oobe_update.html

@@ -30,6 +30,9 @@
         aria-live="polite" id="checking-for-updates-dialog">
       <iron-icon icon="oobe-update:googleg" slot="oobe-icon"></iron-icon>
       <h1 slot="title" i18n-content="checkingForUpdates"></h1>
+      <div slot="subtitle" class="update-subtitle" id="checkingForUpdatesMsg"
+          i18n-content="checkingForUpdatesMsg">
+      </div>
       <div slot="subtitle" class="update-subtitle" id="checkingForUpdateCancelHint"
           i18n-content="cancelUpdateHint" hidden="[[!cancelAllowed]]">
       </div>