net: pin (*.)gstatic.com, not just ssl.gstatic.com

BUG=335567
R=cevans@chromium.org, palmer@chromium.org

Review URL: https://codereview.chromium.org/134643021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246360 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246360