mojo: Fix Java binding generator for array<enum> am: e8b2235c46 am: ab05e985a9 am: cfbd04e518

Original change: https://android-review.googlesource.com/c/platform/external/libchrome/+/1498099

Change-Id: I50fcc1302ef8bf8ddc304ed6e48cbc15c9f14121