Replaced enum strings with ints in Activity Log database

Several of the Activity Log actions have fields that are enums. Previously we were saving them as strings. To save a little database space they are now going to be saved as ints.

R=mpcomplete@chromium.org
BUG=238256

Review URL: https://chromiumcodereview.appspot.com/14774012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@201316 0039d316-1c4b-4281-b951-d872f2087c98
11 files changed