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Revert of Unload the ScopedGaiaAuthExtension asynchronously. (patchset #2 id:20001 of https://codereview.chromium.org/961443003/)

Reason for revert:
Broke BookmarkSyncPromoControllerTest.SignInLink on Mac ASan 64: https://build.chromium.org/p/chromium.memory/builders/Mac%20ASan%2064%20Tests%20%281%29/builds/7363

Original issue's description:
> Unload the ScopedGaiaAuthExtension asynchronously.
>
> If we don't do this, then we have a race condition between unloading
> this extension, and trying to use it because we have manually
> navigated to it.
>
> BUG=460431
>
> Committed: https://crrev.com/1805c4c5c4b5292cca51a54f379cde498db7238b
> Cr-Commit-Position: refs/heads/master@{#318140}

TBR=xiyuan@chromium.org,noms@google.com,noms@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=460431

Review URL: https://codereview.chromium.org/944923007

Cr-Commit-Position: refs/heads/master@{#318176}