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This reverts commit bb86e3cd.

Reason for revert: <crbug.com/1135885>

Original change's description:
> Ensure that devtools stays visible when window is made smaller.
>
> Original CL - https://chromium-review.googlesource.com/c/chromium/src/+/1665550
>
> Bug: 974178
> Change-Id: I5792cbd065d1437de2fa44d43407eb70e7b22960
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2447094
> Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
> Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#814196}

TBR=caseq@chromium.org,davidbienvenu@chromium.org

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

Bug: 974178
Change-Id: Idbfcdf1170a60d940d3989d2b0f9bc8e84f74129
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462639Reviewed-by: David Bienvenu <davidbienvenu@chromium.org>
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815631}