Check in the thirdparty libs needed for webkitpy.

Check in the thirdparty libs needed for webkitpy.

This change gets rid of the autoinstaller so that we no longer need
to download any libraries on the fly. This adds about ~6MB to the checkout
size, unfortunately, but that code would be added sooner or later by
running run-webkit-tests or one of the other commands.

There's probably a bunch we can do to slim down the size of these libs
and de-dup them with other copies, but that can wait for subsequent patches,
as we currently have bots failing on the autoinstaller.

This is a large patch; the changes to the non-thirdparty files are
all trivial renames of the imports and the deleting of the autoinstaller
logic.

R=ojan@chromium.org, abarth@chromium.org, eseidel@chromium.org
BUG=230706