Settings People Sync: Add 'Reset Sync' message for forgotten passphrase.

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 1576 matching lines @@
   </message>
   <message name="IDS_SETTINGS_EMPTY_PASSPHRASE_ERROR" desc="Error message when the passphrase is empty.">
     Empty passphrase is not allowed.
   </message>
   <message name="IDS_SETTINGS_MISMATCHED_PASSPHRASE_ERROR" desc="Error message when the passphrase and confirmation don't match.">
     You must enter the same passphrase twice.
   </message>
   <message name="IDS_SETTINGS_INCORRECT_PASSPHRASE_ERROR" desc="Message when the passphrase is incorrect.">
     The passphrase you entered is incorrect.
   </message>
+  <message name="IDS_SETTINGS_PASSPHRASE_RECOVER" desc="Message about how to recover from a lost passphrase.">
+    If you forgot your passphrase or want to change this setting, <ph name="BEGIN_LINK">&lt;a href="$1" target=&quot;_blank&quot;&gt;<ex>&lt;a href="$1" target=&quot;_blank&quot;&gt;</ex></ph>reset sync<ph name="END_LINK">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>.
+  </message>
   <message name="IDS_SETTINGS_PASSPHRASE_PLACEHOLDER" desc="Placeholder for the passphrase field.">
     Passphrase
   </message>
   <message name="IDS_SETTINGS_PASSPHRASE_CONFIRMATION_PLACEHOLDER" desc="Placeholder for the confirm-passphrase field.">
     Confirm passphrase
   </message>
   <message name="IDS_SETTINGS_SUBMIT_PASSPHRASE" desc="Text for the button which, when clicked, submits a sync password for verification.">
     Submit
   </message>
   <message name="IDS_SETTINGS_USE_DEFAULT_SETTINGS" desc="Text for button which, when clicked, activates the default sync settings.">
@@ skipping 290 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>