Display confirmation dialog for untrusted signins

BUG=252062

Review URL: https://chromiumcodereview.appspot.com/17482002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@208520 0039d316-1c4b-4281-b951-d872f2087c98
  virtual ~InlineLoginUIOAuth2Delegate() {}

  virtual ~InlineLoginUIOAuth2Delegate() {}
