Hook up the experimental ns to APM in chrome.

BUG=334273
TEST=content_unittests, nothing breaks.
R=grunell@chromium.org

Review URL: https://codereview.chromium.org/183883013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254758 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254758