vpn-manager: Remove libbase_ver override in gyp file.

CL:194476 modified platform2 to build against libchrome-242728. The
libbase_ver override in the gyp file is no longer needed.

TEST=`FEATURES=test emerge-$BOARD platform2`
TEST=Verify that l2tpipsec_vpn is linked against libchrome-242728.

Change-Id: Ie60a0c98ca242c129e7a83352223414957ec898e
Reviewed-on: https://chromium-review.googlesource.com/196707
Commit-Queue: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed