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This reverts commit 2ff5fdbc.

Reason for revert: Causing compile failures on linux-chromeos-chrome
https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome/4233

Original change's description:
> Enable -Wunreachable-code in (non-arm) Chrome OS builds.
> 
> Bug: 1063529,346399
> Change-Id: I313ebf4cc16885d1f9bdc5a2ed8db524467735f2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2116590
> Commit-Queue: Ben Pastene <bpastene@chromium.org>
> Reviewed-by: Ben Pastene <bpastene@chromium.org>
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Auto-Submit: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#752618}

TBR=oshima@chromium.org,thakis@chromium.org,bpastene@chromium.org

Change-Id: I01a4f609e3936fa98da9127d7f9858a4a61e2ecd
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1063529, 346399
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2115865Reviewed-by: calamity <calamity@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752723}