bind/java: find jbytearray class info using jbytearray object.
bind/java: find jbytearray class info using jbytearray object.

The previous way (JNIEnv's FindClass with "[B") does not work
in Android-L for some reason.

Change-Id: I5cccb7bbf651df981a923ecade863302521d5c5c
Reviewed-on: https://go-review.googlesource.com/9783
Reviewed-by: David Crawshaw <a2f0bf29257797dd66800b4fbb9945c3e216c004@golang.org>

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