ntp: use web store as default mv tile instead of themes gallery

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.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 8298 matching lines @@
         Options
       </message>
       <message name="IDS_NEW_TAB_APP_CREATE_SHORTCUT"
                desc="Text for the button that creates an app shortcut.">
         Create shortcut
       </message>
       <message name="IDS_NEW_TAB_TRASH_LABEL"
                desc="Text for the trash can that appears when the user drags apps.">
         Remove from <ph name="SHORT_PRODUCT_NAME">$1<ex>Chrome</ex></ph>.
       </message>
+      <message name="IDS_NEW_TAB_WEBSTORE_PAGE_TITLE"
+         desc="Title for the hard coded thumbnail that represents the webstore page. This is used on the NTP when there aren't enough thumbnails to show.">
+        Apps, Extensions and Themes
+      </message>
       <message name="IDS_APP_DEFAULT_PAGE_NAME"
                desc="Default name for the first 'Apps' page on the New Tab Page.">
         Apps
       </message>
       <message name="IDS_APP_CONTEXT_MENU_OPEN_PINNED"
                desc="Text for the button that opens the app in a pinned tab.">
         Open as pinned tab
       </message>
       <message name="IDS_APP_CONTEXT_MENU_OPEN_REGULAR"
                desc="Text for the button that opens the app in a regular tab.">
@@ skipping 4987 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>