Change "Remove thumbnails" to "Remove a thumbnail" for clarity. Also update ...

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 3326 matching lines @@
       </message>
       <message name="IDS_NEW_TAB_BOOKMARKS"
                desc="The 'Bookmarks' heading on the new tab page">
         Recent bookmarks
       </message>
       <message name="IDS_NEW_TAB_RECENT"
                desc="The text to show for the 'Recent' heading. It is used to describe recent activity such as recent history, bookmarks, tabs, searches etc.">
         Recent
       </message>
       <message name="IDS_NEW_TAB_HISTORY_SHOW"
-               desc="The 'Show history' link on the new tab page">
+               desc="The link on the new tab page that takes users to the dedicated History page">
         Show full history
       </message>
       <message name="IDS_NEW_TAB_REMOVE_THUMBNAILS"
-         desc="The 'Remove thumbnails' link on the new tab page">
-        Remove thumbnails
+         desc="The link on the new tab page that lets users remove one or more thumbnails">
+        Remove a thumbnail
       </message>
       <message name="IDS_NEW_TAB_MOST_VISITED_DONE_REMOVING_BUTTON"
          desc="The caption of the button used to validate the removal of thumbnails">
         Done
       </message>
       <message name="IDS_NEW_TAB_MOST_VISITED_CANCEL_REMOVING_BUTTON"
          desc="The caption of the button used to cancel the current removal thumbnails mode">
         Cancel
       </message>
       <message name="IDS_NEW_TAB_RESTORE_THUMBNAILS_LINK"
@@ skipping 505 matching lines @@
         Use system title bar and borders
       </message>
 
       <message name="IDS_RGBA_CSS_FORMAT_STRING" translateable="false" desc="The format string to use when converting colors to CSS rgba().">
         rgba($1, $2, $3, $4)
       </message>
 
     </messages>
   </release>
 </grit>