This reverts commit 92842b6a.

Reason for revert: This breaks fuchsia/engine/browser/media_browsertest.cc
https://ci.chromium.org/p/chromium/builders/ci/Fuchsia%20ARM64/103950

Original change's description:
> [Fuchsia] Add WebEngineIntegrationTests.PlayVideo test
> 
> Previously there were tests that play audio and tests that play video,
> but no tests were playing a file with both audio and video. Also video
> was not played to the end. Added PlayVideo test that plays
> bear-vp9-opus.webm to the end. Also updated SetBlockMediaLoading tests
> to share play_video.html and reduce amount of duplicated code.
> 
> Bug: b/153914562
> Change-Id: Iba492ec252f692f7aa3f93c319d858a91bb38278
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2219404
> Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
> Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
> Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#773338}

TBR=kmarshall@chromium.org,sergeyu@chromium.org

Change-Id: Ief517228f418509838bb07a1318b4e7a80b1aedd
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b/153914562
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2222697Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773373}