Removes j2cl_pass flag since it is now auto enabled if j2cl code is detected.
Removes j2cl_pass flag since it is now auto enabled if j2cl code is detected.

RELNOTES: n/a

Tested:
    tap_presubmit: http://test/OCL:171268370:BASE:171771929:1507711337640:2983028e
    Some tests failed; test failures are believed to be unrelated to this CL
PiperOrigin-RevId: 172036369

google/j2cl,google/j2cl,google/j2cl,google/j2cl,google/j2cl