Disable HostDriven_SyncTest.testDisableAndEnableSync

BUG=348951
NOTRY=true

Review URL: https://codereview.chromium.org/180273024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254791 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254791