GitLab

Also removes iOS 4.3 handling, as 4.3 is no longer supported.

BUG=None

Review URL: https://chromiumcodereview.appspot.com/21513008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@215962 0039d316-1c4b-4281-b951-d872f2087c98