Revert of Standardize usage of virtual/override/final in ipc/ (patchset #1 id:1 of https://codereview.chromium.org/645623006/)

Reason for revert:
Addressing reviewer comments in a followup patch.

Original issue's description:
> Standardize usage of virtual/override/final in ipc/
>
> This patch was automatically generated by applying clang fixit hints
> generated by the plugin to the source tree.
>
> BUG=417463
> TBR=agl@chromium.org
>
> Committed: https://crrev.com/39be52ebbd6681c7d79ad63e2a0ab028075af0c2
> Cr-Commit-Position: refs/heads/master@{#300481}

TBR=agl@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=417463

Review URL: https://codereview.chromium.org/669953003

Cr-Commit-Position: refs/heads/master@{#300521}


CrOS-Libchrome-Original-Commit: f3076af7e0dfc078e65039a0e6faebf9a7628a63
30 files changed
tree: 60fade4036a4df919bf888c71899409cf91ba551
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/