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This reverts commit 9cd2322d.

Reason for revert: This CL seems causing flaky timeouts of HeadlessProtocolBrowserTest.VirtualTimeErrorLoop.
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=headless_browsertests&tests=HeadlessProtocolBrowserTest.VirtualTimeErrorLoop%0A

Original change's description:
> Implemented headless compositor protocol tests for basic rAF, GIF and CSS animations.
> 
> Change-Id: I956ea3523eb42b6d7f0cf851a126c6a11578912e
> Reviewed-on: https://chromium-review.googlesource.com/1121378
> Commit-Queue: Peter Kvitek <kvitekp@chromium.org>
> Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#572253}

TBR=dgozman@chromium.org,pfeldman@chromium.org,kvitekp@chromium.org

Change-Id: I777f261f3d4a69ca15cdc4cb717ea485bc5308c4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/1125480Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572467}