Use a Finch Experiment to control the Browser Blacklist

Also increase the states stored in the register to prevent
the setup code from running multiple times per version if
it fails to start one time.

BUG=329023

Review URL: https://codereview.chromium.org/120963002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243967 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243967