Disable an extension when it is upgraded to a version that requires more
permissions then before, and prompt the user to re-enable.

Incidentally, this required adding support for disabling extensions.

BUG=12140
TEST=covered by unit tests

Review URL: http://codereview.chromium.org/165414

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@23480 0039d316-1c4b-4281-b951-d872f2087c98
25 files changed