Revert 254791 "Disable HostDriven_SyncTest.testDisableAndEnableSync"

> Disable HostDriven_SyncTest.testDisableAndEnableSync
>
> BUG=348951
> NOTRY=true
>
> Review URL: https://codereview.chromium.org/180273024

NOTRY=true
R=boliu@chromium.org, nyquist@chromium.org
TBR=nyquist@chromium.org

Review URL: https://codereview.chromium.org/186643004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255168 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255168