GitLab

- The GTK login prompt dialog is used for HTTP auth. Some websites need HTTP
  basic access authentication, then the login prompt dialog is required.

BUG=90445
TEST=HTTP authentication websites tested
TBR=jam@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10823099

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149395 0039d316-1c4b-4281-b951-d872f2087c98