The AllUrlsApiTest.WhitelistedExtension test should no longer flake.
The AllUrlsApiTest.WhitelistedExtension test should no longer flake.

This is the second attempt to land this fix. The first one was https://codereview.chromium.org/1442593002/ but it also enabled another test that began to flake on Windows XP bots, so that patch had been reverted.

BUG=174341
R=finnur@chromium.org

Review URL: https://codereview.chromium.org/1483533002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#361983}

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