Stabilize core Mojo ABI

Removes the last dubious API surface (size_t usage) in the core ABI and
documents the ABI as stable.

Bug: 822034,819046
Change-Id: I60438dd6613d45738514a92ce8c21777b859bfee
Reviewed-on: https://chromium-review.googlesource.com/1062932
Reviewed-by: Jay Civelli <jcivelli@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559348}

CrOS-Libchrome-Original-Commit: 1da30cab1d95b4d161e3ab570de0ed413fa97af0
6 files changed
tree: 70d3d332c0c7f20429d832ceb1aa149dc0e8109d
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/