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This reverts commit bcc4146d.

Reason for revert: android.webkit.cts.WebViewStartupTest#testCookieManagerBlockingUiThread is consistently failing.

Bug: 905025

Original change's description:
> [TaskScheduler]: Migrate off of ScopedAllowWait in /android_webview
> 
> base::ThreadRestrictions::ScopedAllowWait is deprecated in favor of its more
> explicit counterpart.
> 
> It should have been replaced by :
>  * base::ScopedAllowBaseSyncPrimitivesForTesting in test files.
>  * base::ScopedAllowBaseSyncPrimitives in non-test files
>  * base::ScopedAllowBaseSyncPrimitivesOutsideBlockingScope when it's used on threads
>    that don't allow blocking
> The last one is strongly frowned upon but this CL aims to document existing
> behavior rather than address it. Owners are encouraged to follow-up by fixing
> unnecessary waits and more particularly unnecessary waits
> outside-blocking-scope.
> 
> Note: The non-for-testing versions require friend'ing in thread_restrictions.h
> but care was taken to add these friends ahead of git cl split (since it wasn't
> possible to do a line-by-line associated CL split).
> Refer to the top-level CL if necessary :
> https://chromium-review.googlesource.com/c/chromium/src/+/1288533
> 
> Please CQ if LGTY!
> 
> This CL was uploaded by git cl split.
> 
> R=​torne@chromium.org
> 
> Bug: 766678
> Change-Id: I30e57cb0d9a0b1a449a4227561e97ea330ff6a12
> Reviewed-on: https://chromium-review.googlesource.com/c/1325195
> Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
> Reviewed-by: Gabriel Charette <gab@chromium.org>
> Reviewed-by: Richard Coles <torne@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#607674}

TBR=gab@chromium.org,torne@chromium.org,etiennep@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 766678
Change-Id: If1ee0994f4387786662d7814617b297939b4dffb
Reviewed-on: https://chromium-review.googlesource.com/c/1337637Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608392}