ipc: Remove unnecessary attachment broker plumbing.

The original design was to pass around an instance of an attachment broker. The
new design uses a single global, and no longer needs any plumbing. This CL
removes the last vestiges of the plumbing.

BUG=493414

Review URL: https://codereview.chromium.org/1354973006

Cr-Commit-Position: refs/heads/master@{#350471}


CrOS-Libchrome-Original-Commit: 30dc2811d9c106d733cea51f5600875cacba2f80
24 files changed
tree: 2008f70e5d34bcb99f6084ab6ce471d881a06562
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/