MD Settings: validate home button url input

chrome/app/settings_strings.grdp

Index: chrome/app/settings_strings.grdp
diff --git a/chrome/app/settings_strings.grdp b/chrome/app/settings_strings.grdp
index 61993ae8a1f6f0475b0dd8445561d1dbf2833c7c..fe63039959d3bd6486a846f4342165e8cbd5041f 100644
--- a/chrome/app/settings_strings.grdp
+++ b/chrome/app/settings_strings.grdp
@@ -340,6 +340,9 @@
   <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.">
@@ -1729,9 +1732,6 @@
   <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>