Remove flags for enabling Drive offline mode for M34 launch.

BUG=307300

Review URL: https://codereview.chromium.org/145703004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247897 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247897