MD Settings: Show "Set date and time" button when relevant

chrome/app/settings_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Settings-specific strings (included from generated_resources.grd). -->
 <grit-part>
   <!-- About Page -->
   <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
     </message>
     <message name="IDS_SETTINGS_ABOUT_PAGE_ARC_VERSION" desc="Label for ARC version">
       ARC Version
@@ skipping 913 matching lines @@
     </message>
     <message name="IDS_SETTINGS_TIME_ZONE" desc="Label for the picker which allows users to choose their time zone.">
       Time zone:
     </message>
     <message name="IDS_SETTINGS_TIME_ZONE_GEOLOCATION" desc="Label for the checkbox which enables setting the time zone automatically with the detected location of the device.">
       Set time zone automatically using your location
     </message>
     <message name="IDS_SETTINGS_USE_24_HOUR_CLOCK" desc="Label for the checkbox which enables a 24-hour clock (as opposed to a 12-hour clock).">
       Use 24-hour clock
     </message>
+    <message name="IDS_SETTINGS_SET_DATE_TIME" desc="Label for the button that shows the dialog for setting the system date and time.">
+      Set date and time
+    </message>
 
     <!-- Easy Unlock Page -->
     <message name="IDS_SETTINGS_EASY_UNLOCK_SECTION_TITLE" desc="The title of the Easy Unlock section on the settings page.">
       Smart Lock (beta)
     </message>
     <message name="IDS_SETTINGS_EASY_UNLOCK_SETUP_INTRO" desc="The text to show in Easy Unlock section to introduce the feature.">
       Unlock your <ph name="DEVICE_TYPE">$1<ex>Chromebook</ex></ph> with your Android phone.
     </message>
     <message name="IDS_SETTINGS_EASY_UNLOCK_SETUP" desc="The label of the button to set up Easy Unlock section on the settings page.">
       Set up
@@ skipping 1536 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>