Update the toast strings for the new experiment

chrome/app/google_chrome_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This file contains definitions of strings that are specific to
 Google Chrome. These strings will be translated for each locale that Google
 Chrome supports. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/google_chrome_strings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 469 matching lines @@
       </message>
       <message name="IDS_TRY_TOAST_TRY_OPT" desc="First option radio button on the dialog to try chrome">
         Try it out (already installed)
       </message>
       <message name="IDS_TRY_TOAST_CANCEL" desc="Try chrome again dialog Cancel button">
         Don't bug me
       </message>
       <message name="IDS_TRY_TOAST_WHY" desc="Text of the url link that explains why this dialog is being shown">
         Why am I seeing this?
       </message>
+      <message name="IDS_TRY_TOAST_SET_DEFAULT" desc="Text of the checkbox to make chrome the default browser">
+        Make it my default browser
+      </message>
       <!-- about:conflicts strings -->
       <message name="IDS_CONFLICTS_CHECK_PAGE_TITLE_LONG" desc="The long title on the compatibility page">
         Modules loaded into Google Chrome
       </message>
       <message name="IDS_CONFLICTS_CHECK_WARNING_CONFIRMED" desc="Warning label on the compatibility page">
         This module is known to conflict with Google Chrome.
       </message>
       <message name="IDS_CONFLICTS_CHECK_WARNING_SUSPECTED" desc="Warning label on the compatibility page">
         A module with the same name has been known to conflict with Google Chrome.
       </message>
@@ skipping 217 matching lines @@
         Chrome Autofill settings
       </message>
 
       <!-- Web Intents -->
       <message name="IDS_INTENT_PICKER_INSTALL_EXTENSION" desc="Text on the button in the web intent picker that installs an extension then uses the extension as an intent service.">
         Add to Chrome
       </message>
     </messages>
   </release>
 </grit>