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.
Also, this uses RegQueryValueEx and RegSetValueEx
instead of RegSetKeyValue and RegGetValue since
they aren't available on XP.
TBR=sky@chromium.org
BUG=329023
Review URL: https://codereview.chromium.org/
133923002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244517 0039d316-1c4b-4281-b951-d872f2087c98