Add an update warning for downloading over mobile data

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- Main Page -->
   <if expr="chromeos">
     <message name="IDS_SETTINGS_SECONDARY_USER_BANNER" desc="Banner displayed in settings page when the user is secondary in a multi-profile session.">
       Some settings belonging to <ph name="PRIMARY_EMAIL">$1<ex>john@google.com</ex></ph> are being shared with you. These settings only affect your account when using multiple sign-in.
     </message>
   </if>
 
@@ skipping 89 matching lines @@
     </message>
     <message name="IDS_SETTINGS_ABOUT_PAGE_DIALOG_CHANNEL_STABLE" desc="The stable option in the channel select.">
       Stable
     </message>
     <message name="IDS_SETTINGS_ABOUT_PAGE_DIALOG_CHANNEL_BETA" desc="The beta option in the channel select.">
       Beta
     </message>
     <message name="IDS_SETTINGS_ABOUT_PAGE_DIALOG_CHANNEL_DEV" desc="The development option in the channel select.">
       Developer - unstable
     </message>
+
+    <!-- About Page: Update warning dialog -->
+    <message name="IDS_SETTINGS_ABOUT_PAGE_UPDATE_WARNING_MESSAGE" desc="Warning about update over mobile data.">

[michaelpg, 2017/04/04 00:44:52]

nit: "..., specifying the size in megabytes."

[weidongg, 2017/04/04 04:25:10]

Done.

+      Update will be downloaded using <ph name="UPDATE_SIZE_MB">$1<ex>0</ex></ph> MB of mobile data. Would you like to continue?
+    </message>
+    <message name="IDS_SETTINGS_ABOUT_PAGE_UPDATE_WARNING_TITLE" desc="The title of the warning about update over mobile data.">
+      Download update using mobile data
+    </message>
+    <message name="IDS_SETTINGS_ABOUT_PAGE_UPDATE_WARNING_CONTINUE_BUTTON" desc="A button that accepts downloading the update over mobile data.">
+      Continue
+    </message>
   </if>
   <if expr="not chromeos">
     <message name="IDS_SETTINGS_ABOUT_PAGE_RELAUNCH" desc="The label for the relaunch button that relaunches the browser once update is complete">
       Relaunch
     </message>
   </if>
   <if expr="_google_chrome">
     <message name="IDS_SETTINGS_ABOUT_PAGE_REPORT_AN_ISSUE" desc="Text of the button which allows the user to report an issue with Chrome.">
       Report an issue
     </message>
@@ skipping 2837 matching lines @@
       System
     </message>
     <message name="IDS_SETTINGS_SYSTEM_HARDWARE_ACCELERATION_LABEL" desc="Label for the checkbox that forces Chrome to render via hardware acceleration (GPU) when available.">
       Use hardware acceleration when available
     </message>
     <message name="IDS_SETTINGS_SYSTEM_PROXY_SETTINGS_BUTTON" desc="Text for the button that changes a user's network proxy settings.">
       Change proxy settings
     </message>
   </if>
 </grit-part>