[Android] Move setting of contentDescription out from content/ layer.

chrome/android/java/strings/android_chrome_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit current_release="1" latest_public_release="0">
   <outputs>
     <output filename="values-am/android_chrome_strings.xml" lang="am" type="android" />
     <output filename="values-ar/android_chrome_strings.xml" lang="ar" type="android" />
     <output filename="values-bg/android_chrome_strings.xml" lang="bg" type="android" />
     <output filename="values-ca/android_chrome_strings.xml" lang="ca" type="android" />
     <output filename="values-cs/android_chrome_strings.xml" lang="cs" type="android" />
     <output filename="values-da/android_chrome_strings.xml" lang="da" type="android" />
     <output filename="values-de/android_chrome_strings.xml" lang="de" type="android" />
@@ skipping 244 matching lines @@
       </message>
       <message name="IDS_ACCESSIBILITY_MENU_BOOKMARK" desc="Content description for the bookmark button when the page is not currently bookmarked.">
         Bookmark this page
       </message>
       <message name="IDS_ACCESSIBILITY_MENU_FORWARD" desc="Content description for the forward navigation button.">
         Go forward
       </message>
       <message name="IDS_ACCESSIBILITY_MENU_BACK" desc="Content description for the backard navigation button.">
         Go back
       </message>
+      <message name="IDS_ACCESSIBILITY_CONTENT_VIEW" desc="Content description for the content view that holds the web contents [CHAR-LIMIT=30]">
+        Web View
+      </message>
       <!-- ContextMenu -->
       <message name="IDS_CONTEXTMENU_OPEN_IN_NEW_TAB" desc="Context sensitive menu item to open the selected link in a new tab. [CHAR-LIMIT=30]">
         Open in new tab
       </message>
       <message name="IDS_CONTEXTMENU_OPEN_IN_INCOGNITO_TAB" desc="Context sensitive menu item to open the selected link in a new incognito tab. [CHAR-LIMIT=30]">
         Open in incognito tab
       </message>
       <message name="IDS_CONTEXTMENU_COPY_EMAIL_ADDRESS" desc="Context sensitive menu item for copying email address. [CHAR-LIMIT=30]">
         Copy email address
       </message>
@@ skipping 129 matching lines @@
       <message name="IDS_ADD_TO_HOMESCREEN_TITLE" desc="Edit text title for Add to homescreen dialog [CHAR-LIMIT=30]">
         Title
       </message>
       <message name="IDS_MENU_ADD_TO_HOMESCREEN" desc="Menu item for adding a shortcut to the homescreen. [CHAR-LIMIT=27]">
         Add to homescreen
       </message>
 
     </messages>
   </release>
 </grit>