MD Settings: validate home button url input

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 322 matching lines @@
   </message>
   <message name="IDS_SETTINGS_EDIT" desc="Label used on a menu item or button, used in different contexts to edit an item.">
     Edit
   </message>
   <message name="IDS_SETTINGS_TOGGLE_ON" desc="Label used on a main settings toggle that is on.">
     On
   </message>
   <message name="IDS_SETTINGS_TOGGLE_OFF" desc="Label used on a main settings toggle that is ooff.">
     Off
   </message>
+  <message name="IDS_SETTINGS_NOT_VALID" desc="Text indicating that an input is not valid.">
+   Not valid
+  </message>
 
   <!-- Passwords and Autofill Page -->
   <message name="IDS_SETTINGS_PASSWORDS_AND_AUTOFILL_PAGE_TITLE" desc="Name of the settings page which allows managing passwords and autofill settings.">
     Passwords and forms
   </message>
   <message name="IDS_SETTINGS_AUTOFILL" desc="Name for the autofill section and toggle.">
     Autofill settings
   </message>
   <message name="IDS_SETTINGS_GOOGLE_PAYMENTS" desc="Label used to differentiate when an address or credit card entry comes from Google Payments. This should follow the casing of the 'Google Payments' brand.">
     Google Payments
@@ skipping 1369 matching lines @@
   <!-- Search Engines Page -->
   <message name="IDS_SETTINGS_SEARCH_ENGINES" desc="Name of the settings page which manages search engines.">
     Search Engines
   </message>
   <message name="IDS_SETTINGS_SEARCH_ENGINES_ADD_SEARCH_ENGINE" desc="Title for a dialog that allows adding a new search engine.">
     Add search engine
   </message>
   <message name="IDS_SETTINGS_SEARCH_ENGINES_EDIT_SEARCH_ENGINE" desc="Title for a dialog that allows editing an existing search engine.">
     Edit search engine
   </message>
-  <message name="IDS_SETTINGS_SEARCH_ENGINES_NOT_VALID" desc="Text indicating that the input to a given text field in the add/edit search engine dialog is not invalid.">
-   Not valid
-  </message>
   <message name="IDS_SETTINGS_SEARCH_ENGINES_DEFAULT_ENGINES" desc="Label for 'default' Search Engines section">
     Default search engines
   </message>
   <message name="IDS_SETTINGS_SEARCH_ENGINES_OTHER_ENGINES" desc="Label for 'other' Search Engines section">
     Other search engines
   </message>
   <message name="IDS_SETTINGS_SEARCH_ENGINES_NO_OTHER_ENGINES" desc="Label shown when the 'other' Search engines section is empty">
     Other saved search engines will appear here
   </message>
   <message name="IDS_SETTINGS_SEARCH_ENGINES_EXTENSION_ENGINES" desc="Label for a section that displays search engines added by extensions">
@@ skipping 1200 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>