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This reverts commit 191b1ead.

Reason for revert: We can't process protocol synchronously in the headless embedder.

Original change's description:
> DevTools: change Target.disposeBrowserContext to force-close WebContents
> 
> This patch changes the behavior of Target.disposeBrowserContext method
> to force-close all the belonging WebContents.
> 
> R=​dgozman
> BUG=836272
> 
> Change-Id: Iec3da859363120a22c2648b31102457aee20e6cb
> Reviewed-on: https://chromium-review.googlesource.com/1031774
> Commit-Queue: Andrey Lushnikov <lushnikov@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
> Reviewed-by: Alex Clarke <alexclarke@chromium.org>
> Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#555640}

TBR=dgozman@chromium.org,sky@chromium.org,lushnikov@chromium.org,caseq@chromium.org,alexclarke@chromium.org

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

Bug: 836272
Change-Id: Ib5d06ad2ce6816a82c0819c693b2eb2819d3a502
Reviewed-on: https://chromium-review.googlesource.com/1045525Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556276}