ipc: Use a global for the process's attachment broker.

This eliminates the need for a lot of plumbing, at the expense of yet another
global.

BUG=493414

Review URL: https://codereview.chromium.org/1292263003

Cr-Commit-Position: refs/heads/master@{#348649}


CrOS-Libchrome-Original-Commit: 5708aae6ec926bddd69f3e9058f129d10a0d1873
5 files changed
tree: 64b76258e70748f51c0df65b36aab4228f1f45a4
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/