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This reverts commit 8505818b.

Reason for revert: This CL is causing CookieStoreIOSTest.SameValueDoesNotCallHook to fail on iPhone 7, iOS 11 devices.

Original change's description:
> Convert SystemCookieStore to Async.
> 
> * Converts SystemCookieStore to Async
> * Add Async functions to NSHTTPSystemCookieStore and keep the synchronous
> functions.
> * Move creation time management to systemCookieStore.
> * Update cookie_store_ios_presistent_unittest & 
> cookie_store_ios_unittests to account for SystemCookieStore changes 
> * (As CookieStoreIOS is using systemCookieStore internally).
> 
> Another CL is in progress to add WKSystemCookieStore & unit_tests for 
> systemCookieStore (to handle async methods) with template for both 
> NSHTTP & WK systemCookieStore.
> 
> Bug: 759229, 759227, 767948
> Change-Id: I1c24c82540f4781a0bec77ebfa4a861ca7433391
> Reviewed-on: https://chromium-review.googlesource.com/675804
> Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
> Reviewed-by: Eugene But <eugenebut@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#505033}

TBR=mmenke@chromium.org,eugenebut@chromium.org,mrefaat@chromium.org

Change-Id: I43c71a95910d14f4717111a66f0fb0556a91fb8f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 759229, 759227, 767948
Reviewed-on: https://chromium-review.googlesource.com/691037Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505178}