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}