Update content desciption string for bookmark button in NTP toolbar

chrome/android/java/strings/android_chrome_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- android_chrome_strings.grd contains strings for Chrome for Android.
 
 FAQ:
   - How do I add, change, or remove a string?
       Just update this file.
   - Translations will happen automatically??
       Yes, indeed. Just add your string before the branch point and
       make the description good.
@@ skipping 1914 matching lines @@
       </message>
       <message name="IDS_OFFLINE_PAGES_FREE_UP_SPACE_MESSAGE" desc="Text explaining how many offline copies of saved pages are going to be removed and how much storage is going to be freed.">
         Delete <ph name="PAGES_NUMBER">%1$d<ex>8</ex></ph> offline copies not used in the past month? This will clear <ph name="TOTAL_PAGE_SIZE">%2$s<ex>8.3 MB</ex></ph> of space.
       </message>
       <message name="IDS_OFFLINE_PAGES_FOLDER_EMPTY" desc="Text explaining that the currently selected saved pages folder is empty.">
         No saved pages here
       </message>
       <message name="IDS_OFFLINE_PAGES_NTP_BUTTON_NAME" desc="Text for saved pages button on the new tab page [CHAR-LIMIT=20]">
         Saved pages
       </message>
+      <message name="IDS_OFFLINE_PAGES_NTP_BUTTON_ACCESSIBILITY" desc="Content description for saved pages button on the new tab page.">
+        Saved pages
+      </message>
       <message name="IDS_OFFLINE_PAGES_OPEN_STORAGE_SETTINGS_DIALOG_TEXT" desc="Text of the dialog asking if the user wants to open storage settings to remove files to make space.">
         Your device storage is full. Please remove other media to make space.
       </message>
       <message name="IDS_OFFLINE_PAGES_PAGE_SAVED" desc="Message shown after user adds a new offline page.">
         Page saved offline
       </message>
       <message name="IDS_OFFLINE_PAGES_PAGE_SKIPPED" desc="Message shown after a page was saved as a bookmark, but an offline copy was not created due to that the page is not HTTP or HTTPS page.">
         Page saved
       </message>
       <message name="IDS_OFFLINE_PAGES_PAGE_SAVED_STORAGE_NEAR_FULL" desc="Message shown after user adds a new offline page and the storage is almost full.">
@@ skipping 400 matching lines @@
       </message>
       <message name="IDS_PHYSICAL_WEB_EMPTY_LIST" desc="The message displayed in place of a list of nearby URLs when there are no URLs to display.">
         There are no nearby web pages found
       </message>
       <message name="IDS_PHYSICAL_WEB_EMPTY_LIST_SCANNING" desc="The message displayed in place of a list of nearby URLs while still scanning for nearby URLs.">
         Looking for nearby web pages
       </message>
     </messages>
   </release>
 </grit>