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This reverts commit 62ff616d.

Reason for revert: 
Both of these are failing on MSAN:
SigninReauthViewControllerBrowserTest.CancelReauthDialog
SigninReauthViewControllerBrowserTest.ConfirmReauthDialog

Original change's description:
> [signin] Add reauth browser tests with a fake Gaia page
> 
> This CL adds a new set of tests for the reauth dialog. These tests
> check interactions with a Gaia Reauth endpoint that is imitated through
> an EmbeddedTestServer.
> 
> The main "embedded/xreauth/chrome" endpoint operates in two modes:
> - In the default mode, the endpoint redirects to the "challenge" URL
> whose response can be controlled within the test by a
> ControllableHttpResponse.
> - If the "?done" query is present, the endpoint returns the
> HTTP_NO_CONTENT response that signifies a successful reauth.
> 
> The CL also extracts common test code into test suite functions to
> reduce the code duplication and make the tests code more readable.
> 
> Bug: 1045515
> Change-Id: I89d4aac57ef25168def1341fb63b1a7498dcfa0f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225396
> Commit-Queue: Alex Ilin <alexilin@chromium.org>
> Reviewed-by: David Roger <droger@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#774205}

TBR=droger@chromium.org,alexilin@chromium.org

Change-Id: I9e322b00bb98f9394b81fda2a0e62bf5db5cd9e9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1045515, 1090451
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225852Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774265}