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This reverts commit 73ac7d88.

Reason for revert: new tests consistently crashes on Mac builders,
see crbug.com/1126379.

Original change's description:
> Keep DevTools navigator.language in-sync with chromiums app language
> 
> DevTools is considered part of the Chromium UI, so it should be
> displayed in the same language as the Chromium UI and not the configured
> accepted language (chrome://settings/languages).
> 
> This CL moves the code where we override the DevTools renderer
> preferences around so it works consistently across platforms. It also
> installs an event handler in case the user changes his language settings
> so `navigator.language` has consistently the same value in the
> DevTools renderer.
> 
> R=​petermarshall@chromium.org
> 
> Bug: chromium:1125490
> Change-Id: Iaac568d82357d6ae7c50d5022d687f4f1741b147
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398538
> Commit-Queue: Simon Zünd <szuend@chromium.org>
> Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
> Reviewed-by: Peter Marshall <petermarshall@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#805219}

TBR=caseq@chromium.org,petermarshall@chromium.org,szuend@chromium.org

Change-Id: I5d80fbfce70fd62336b15beb0d29a7bbe09ba6fd
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1125490, chromium:1126379
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2400280Reviewed-by: Maksim Moskvitin <mmoskvitin@google.com>
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#805249}