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

chrome/app/chromium_strings.grd

Index: chrome/app/chromium_strings.grd
diff --git a/chrome/app/chromium_strings.grd b/chrome/app/chromium_strings.grd
index 2e1260b1d7e14a719f68064307328ea20c8c0cb2..2617acb566edbead90981e3646437e27ce6b91ec 100644
--- a/chrome/app/chromium_strings.grd
+++ b/chrome/app/chromium_strings.grd
@@ -342,10 +342,6 @@ be available for now. -->
                desc="Title for the hard-coded thumbnail that represents the Google Chrome Welcome page.  This is used on the NTP when there aren't enough thumbnails to show.">
         Welcome to Chromium
       </message>
-      <message name="IDS_NEW_TAB_THEMES_GALLERY_PAGE_TITLE"
-         desc="Title for the hard coded thumbnail that represents the Themes Gallery page. This is used on the NTP when there aren't enough thumbnails to show.">
-        Chromium Themes Gallery
-      </message>
       <if expr="not pp_ifdef('chromeos')">
         <message name="IDS_EXTERNAL_PROTOCOL_INFORMATION" desc="General information about what Chrome is trying to do when opening this external protocol">
           Chromium needs to launch an external application to handle <ph name="SCHEME">$1<ex>acrobat:</ex></ph> links. The link requested is <ph name="PROTOLINK">$2<ex>acrobat:yourpdf</ex></ph>.