Notify user on spell check dictionary download failure
This CL shows an error message on chrome://settings/languages page when Chrome could not download the spell check dictionary. The message reads "Spell check dictionary download failed." Below the message is a "Retry" button that the user
can click to retry downloading the spell check dictionary. If the download fails
more than once, then Chrome adds: "Please check with your network administrator
to make sure that the firewall is not blocking downloads from Google servers."
If download is in progress, then the message says "Downloading spell check
dictionary..."
BUG=164532
Review URL: https://chromiumcodereview.appspot.com/
11804003
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@178704 0039d316-1c4b-4281-b951-d872f2087c98