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ICU is configured with the currently-configured locale in each WebEngine
process when it starts up.

In the browser process the locale is monitored and changes applied
at run-time, to ensure that e.g. accept-language headers are up to date.

The locale is passed by the browser process to some child processes
(e.g. renderers) when they are started. Renderers in particular cannot
have their locale re-configured dynamically once started.

Bug: 1156404, 1157244
Bug: b/168161909
Change-Id: Id7ff526f1d371b103632c7a284bd16fa694654a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595368
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Wez <wez@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842064}