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This reverts commit df07d66c.

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:
> Eliminate unreachable code.
> 
> This converts runtime checking of BUILDFLAG output to compile-time
> checking.  It also converts NOTREACHED to DLOG(ERROR).
> 
> Bug: 346399
> Change-Id: I85dc2e655a1badccb117bb566f8812c6962416b6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2114400
> Commit-Queue: Peter Kasting <pkasting@chromium.org>
> Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
> Auto-Submit: Peter Kasting <pkasting@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#752603}

TBR=pkasting@chromium.org,rockot@google.com,kmackay@chromium.org

Change-Id: I6f2787f775d211322b8c200410a07f48f0782f9d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 346399
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2116165Reviewed-by: calamity <calamity@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752721}