Changes to default apps promo per ui leads:

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- This file contains definitions of resources that will be translated for
 each locale. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/generated_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 3925 matching lines @@
       <message name="IDS_APPS_PROMO_HEADER" desc="Header for the apps promo">
         New! Discover a world of apps &amp; games
       </message>
       <message name="IDS_APPS_PROMO_TEXT_1" desc="First paragraph of text on the apps promo">
         Visit the &lt;a&gt; Chrome Web Store&lt;/a&gt; to add great apps and games to your new tab page in Chrome.
       </message>
       <message name="IDS_APPS_PROMO_TEXT_2" desc="Second paragraph of text on the apps promo">
         What's an app? Try one of these:
       </message>
       <message name="IDS_APPS_PROMO_HIDE" desc="Text on the button that hides the apps promo">
-        Hide this message
+        No thanks, hide this
       </message>
 
       <!-- Plugins -->
       <message name="IDS_PLUGINS_TITLE" desc="Title for the chrome://plugins page.">
         Plug-ins
       </message>
       <message name="IDS_PLUGINS_DETAILS_MODE_LINK" desc="Text of the link for details mode.">
         Details
       </message>
       <message name="IDS_PLUGINS_NONE_INSTALLED" desc="Text that lets the user know that no plug-ins are installed.">
@@ skipping 7512 matching lines @@
     </includes>
     <structures fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
       <structure name="IDD_CHROME_FRAME_READY_PROMPT" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
 
   </release>
 </grit>