Revert of Reland #2 "ipc: Add a new field num_brokered_attachments to the message header." (patchset #5 id:80001 of https://codereview.chromium.org/1334593002/ )

Reason for revert:
CL was only ever intended to be in 1 canary release.

Original issue's description:
> Reland #2 "ipc: Add a new field num_brokered_attachments to the message header."
>
> This original version of this CL is causing an unusual crash in Canary. This CL
> adds a message verifier to the ipc code so that it can dynamically verify the
> contents of this message that is being corrupted. This CL also verifies the
> message at several different points in the dispatch process. This will help
> narrow down the range of code that is corrupting the message.
>
> I expect this CL to cause ~100 crashes in the next Chrome Canary. I intend to
> revert this CL after a single Canary release.
>
> BUG=527588
>
> Committed: https://crrev.com/a2e71be46dc4bdcbb544db479680f65a390ae8f3
> Cr-Commit-Position: refs/heads/master@{#349056}

TBR=avi@chromium.org,tsepez@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=527588

Review URL: https://codereview.chromium.org/1350823002

Cr-Commit-Position: refs/heads/master@{#349152}


CrOS-Libchrome-Original-Commit: 1fa7dad91bc711eb1e481aa467a2f38c77cdae54
5 files changed
tree: d70be0323507071ad8ad96fc2dd69279d9f3ddf1
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/