Revert "Reland "Implement ProtoChromePromptIPC.""

This reverts commit 5805ac7f82009dd5cfbabd9e813f9d2d521d6bee.

Reason for revert: breaking Windows compile:

In file included from ../..\base/task/lazy_task_runner.h:17:
../..\base/task/task_traits.h(263,5): error: static_assert failed due to requirement 'has_thread_pool ^ has_extension' "Traits must explicitly specify a destination (e.g. ThreadPool or a named thread like BrowserThread)"
    static_assert(
    ^
../..\chrome/chrome_cleaner/ipc/proto_chrome_prompt_ipc.h(108,39): note: in instantiation of function template specialization 'base::TaskTraits::TaskTraits<base::MayBlock, void>' requested here
      base::CreateSequencedTaskRunner({base::MayBlock()});
                                      ^
1 error generated.

Original change's description:
> Reland "Implement ProtoChromePromptIPC."
> 
> This is a reland of e5f1b06d49463065691dfe49b82f1498dae7bd6f
> 
> It was reverted in https://crrev.com/c/1760644 for causing test failures on CI
> builders that couldn't be reproduced on other machines.
> 
> This patch disables the failing tests. A followup will reenable the tests with
> extra debugging to diagnose the failures on the CI builders.
> 
> TBR=wfh
> TBR_REASON=Reland of test-only proto change that was already reviewed.
> 
> Original change's description:
> > Implement ProtoChromePromptIPC.
> >
> > Bug: 969139
> > Change-Id: I35d551b6bdb41b4e6bd7689120c21d9d683ad72f
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1733747
> > Commit-Queue: Oliver Li <olivierli@chromium.org>
> > Reviewed-by: Will Harris <wfh@chromium.org>
> > Reviewed-by: Joe Mason <joenotcharles@google.com>
> > Cr-Commit-Position: refs/heads/master@{#688357}
> 
> Bug: 969139
> Change-Id: Iafdc22cc06fbedd5de73bf8bb7881fc46e01f350
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1759154
> Reviewed-by: Joe Mason <joenotcharles@google.com>
> Reviewed-by: Will Harris <wfh@chromium.org>
> Commit-Queue: Joe Mason <joenotcharles@google.com>
> Cr-Commit-Position: refs/heads/master@{#689074}

TBR=joenotcharles@google.com,wfh@chromium.org,olivierli@chromium.org

Change-Id: I42f06162b45d41212816410027153f89f95a28f1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 969139
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764124
Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689151}