Removed Netflix plugin from the broker whitelist.

TBR=sky@chromium.org
BUG=232969

Review URL: https://codereview.chromium.org/132293004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244397 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244397