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Revert of The AllUrlsApiTest.WhitelistedExtension test should no longer flake. (patchset #3 id:40001 of https://codereview.chromium.org/1442593002/ )

Reason for revert:
The WhitelistedExtension is still flaky on the XP Tests bot, see e.g. https://build.chromium.org/p/chromium.win/builders/XP%20Tests%20%281%29/builds/41174
stdio output:
[ RUN      ] AllUrlsApiTest.WhitelistedExtensionRunsOnExtensionPages
[1636:4084:1120/124530:WARNING:raw_channel.cc(208)] Shutting down RawChannel with write buffer nonempty
[139/464] AllUrlsApiTest.WhitelistedExtensionRunsOnExtensionPages (TIMED OUT)

Original issue's description:
> The AllUrlsApiTest.WhitelistedExtension test should no longer flake.
>
> The test had begun to hang after the refactoring that changed the way the extensions are loaded and reloaded. As a result of that refactoring, the test loaded the pages and tried to get some response from the extensions before they had time to reload.
>
> This change introduces waiting for the extensions reload, so the test should no longer flake.
>
> BUG=174341
>
> R=finnur@chromium.org
>
> Committed: https://crrev.com/454083864ede93660c2f08cf7d0e06ca10013c0d
> Cr-Commit-Position: refs/heads/master@{#359537}

TBR=finnur@chromium.org,voodoo@yandex-team.ru
NOPRESUBMIT=true
NOTREECHECKS=true
BUG=174341

Review URL: https://codereview.chromium.org/1469813003

Cr-Commit-Position: refs/heads/master@{#361090}