This reverts commit c0f1ff24.

Reason for revert: Speculative revert for layout test timeout:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/16402

Original change's description:
> Fix GCC 7 build errors
> 
> BUG=chromium:691681
> R=​franzih@chromium.org
> 
> Change-Id: Id7e5698487f16dc217a804f6d3f24da7213c72b9
> Reviewed-on: https://chromium-review.googlesource.com/530227
> Commit-Queue: Toon Verwaest <verwaest@chromium.org>
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#46045}

TBR=adamk@chromium.org,franzih@chromium.org,mic.besace@gmail.com,verwaest@chromium.org

Change-Id: I2119a87a95ed9eb88b7b32ae436edf28dfc86c16
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:691681
Reviewed-on: https://chromium-review.googlesource.com/541227Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46065}