Don't unmap ports in host_driven/test_case.py.

The sync tests failure seems to have to do with port unmapping. Not unmapping
ports let most of the sync tests pass (only 2 failures remain for an unrelated
reason apparently).
Note that port unmapping was added to avoid exceeding the file descriptor limit
in net_unittests since each test server was listening on a different port. The
sync tests use a server always listening on a same port so unmapping the port
is not strictly needed.

BUG=313809

Review URL: https://codereview.chromium.org/106533002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239467 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239467
Re-initialize DriveService when RefreshToken is obtained later: for v1

If drive_service_->Initialized has never been called with
valid token we need to call it when a token is obtained later.

(v2 version of this patch: https://codereview.chromium.org/110003002/)

BUG=326410
TEST=manual: Launch chrome without signed-in, launch syncfs app (fails),
sign-in and re-launch syncfs app to see it succeeds

Review URL: https://codereview.chromium.org/109713003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239468 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239468