[Autofill] Remove deprecated metrics and support for server-side experiments.

BUG=none
TEST=none
R=vadimb@chromium.org

Review URL: https://codereview.chromium.org/171413007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254737 0039d316-1c4b-4281-b951-d872f2087c98
drive: Add request class for Permissions.insert API.

BUG=348465

Review URL: https://codereview.chromium.org/185723004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254738 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254737
SVN changes up to revision 254738