Reorganizes methods in java_types.h to logical groups. The order in
the source file matches the order in the header file.
Bug: webrtc:8769
Change-Id: Id3e1e80276a747a3d9952598207ac55493ac46b6
Reviewed-on: https://webrtc-review.googlesource.com/46146
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21842}