MD Settings: About: Fixes to channel switcher dialog

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- About Page -->
   <message name="IDS_SETTINGS_ABOUT_PAGE_BROWSER_VERSION" desc="The text label describing the version of the browser, example: Version 57.0.2937.0 (Developer Build) unknown (64-bit)">
     Version <ph name="PRODUCT_VERSION">$1<ex>15.0.865.0</ex></ph> (<ph name="PRODUCT_CHANNEL">$2<ex>Developer Build</ex></ph>) <ph name="PRODUCT_MODIFIER">$3</ph> <ph name="PRODUCT_VERSION_BITS">$4</ph>
   </message>
   <if expr="chromeos">
     <message name="IDS_SETTINGS_ABOUT_PAGE_DETAILED_BUILD_INFO" desc="Label describing the section that shows detailed information about the current Chrome build.">
       Detailed build information
@@ skipping 68 matching lines @@
     </message>
     <message name="IDS_SETTINGS_ABOUT_PAGE_POWERWASH_WARNING_TITLE" desc="The title for the message that warns user about powerwash.">
       Powerwash required on next reboot
     </message>
     <message name="IDS_SETTINGS_ABOUT_PAGE_UNSTABLE_WARNING_MESSAGE" desc="Warning about switching to developer (unstable) channel.">
       You are updating to an unstable version of <ph name="PRODUCT_NAME">$1<ex>Chrome OS</ex></ph> which contains features that are in progress. Crashes and unexpected bugs will occur. Please proceed with caution.
     </message>
     <message name="IDS_SETTINGS_ABOUT_PAGE_UNSTABLE_WARNING_TITLE" desc="The title of the warning about switching to developer (unstable) channel.">
       Warning: you are switching to developer channel
     </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>
   </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 2624 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>