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This reverts commit c92df469.

Reason for revert: This CL caused test failures in https://ci.chromium.org/p/chromium/builders/ci/WebKit%20Linux%20Leak/16175

Original change's description:
> Ensure test settings are fully reset between tests
> 
> Javascript can run after BlinkTestRunner::OnResetRendererAfterWebTest,
> dirtying TestRunner state for the next test. A navigation to about:blank
> is done after every test. This patch resets the TestRunner state after
> the navigation to about:blank, when we are sure no test javascript can
> change TestRunner state. This fixes a class of flaky bugs.
> 
> This behavior happened with video-overlay-scroll.html which would set a
> custom layout dump (setCustomTextOutput) in a fullscreenchange event
> handler. This event handler was not removed at the end of the test
> (this will be fixed in a followup), and would run a second time, after
> the custom text output setting was reset. This caused later tests to
> run with custom text output from video-overlay-scroll.html. With this
> patch, video-scrolled-iframe.html is no longer flaky.
> 
> Code in WebFrameTestProxy::BeginNavigation to intercept navigations
> relied on TestRunner::PolicyDelegateEnabled being reset before it ran.
> This patch now skips WebFrameTestProxy::BeginNavigation when the test
> is not running.
> 
> Bug: 1048597
> Change-Id: I888f7cc2ae91d7d3cfdd143a7573f62cb052c1cc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2275348
> Reviewed-by: danakj <danakj@chromium.org>
> Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
> Commit-Queue: Philip Rogers <pdr@chromium.org>
> Auto-Submit: Philip Rogers <pdr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#784110}

TBR=danakj@chromium.org,wangxianzhu@chromium.org,pdr@chromium.org

Change-Id: Ieb22e1d115bd284aaa942c60ca7c6dc5e8ea71b6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1048597
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276418Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784367}