Add a browser test for popup blocker to test blank-post blocked. For the details, please refer to https://bugs.webkit.org/show_bug.cgi?id=44969.

      BUG=34414
test=popup-blocked-to-post-blank

Review URL: http://codereview.chromium.org/3291012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@59215 0039d316-1c4b-4281-b951-d872f2087c98