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This reverts commit fe6e27d6.

Reason for revert: newly-added OpenOrClosedShadowRootInBackgroundPage is very flaky, see https://ci.chromium.org/p/chromium/builders/ci/Win10%20Tests%20x64 or https://ci.chromium.org/p/chromium/builders/ci/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29

Original change's description:
> Allow access to closed shadow root from Extension
> 
> This CL introduces chrome.dom.openOrClosedShadowRoot that is a
> read-only property to allow access to the closed shadow root in
> the Extension's content script.
> 
> Bug: 778816
> Change-Id: I933bc5d3996a74f46ee75181c535150901a5a46a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2319951
> Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
> Reviewed-by: Mike West <mkwst@chromium.org>
> Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
> Reviewed-by: Mason Freed <masonfreed@chromium.org>
> Reviewed-by: Kent Tamura <tkent@chromium.org>
> Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#809277}

TBR=peria@chromium.org,yukishiino@chromium.org,rdevlin.cronin@chromium.org,tkent@chromium.org,karandeepb@chromium.org,mkwst@chromium.org,masonfreed@chromium.org,myid.shin@igalia.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 778816
Change-Id: If2a26a4aea10a0e03c9a8bca25ca34965bca9110
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2426265Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810056}