Start moving content_settings code out of content code.

BUG=76793
Review URL: http://codereview.chromium.org/6913013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@83910 0039d316-1c4b-4281-b951-d872f2087c98
26 files changed