The Objective-C bindings was recently changed to support the empty name prefix and to use that as the default. This CLs changed the Java generators in the same way, supporting the empty Java package and using it as the default. Change-Id: I857affce686c67638a2b6c4e1da5d6a88d7ba560 Reviewed-on: https://go-review.googlesource.com/34778 Reviewed-by: David Crawshaw <crawshaw@golang.org>