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This makes us (almost) just forward through user actions that
we receive from other programs rather than having them listed
in Chrome's source.  Note that new actions that aren't
present in Chrome still need to be added to
chrome/tools/extract_actions.py, which needs to be rerun to
generate new hashes.

I say "almost" above because metrics still need to be added
to external_metrics.cc due to http://crosbug.com/11095.  Once
it's fixed, that requirement can be easily removed.

I also cleaned up some earlier additions that I made to
extract_actions.py and re-ran it to pick up missing actions.

BUG=chromium-os:10403
TEST=built it.  checked that i see no errors in chrome's log when using the window manager to report a valid user action, but that i still see an error when running "metrics_client -u BogusMetric"

Review URL: http://codereview.chromium.org/6266011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72173 0039d316-1c4b-4281-b951-d872f2087c98