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This is a logical revert of "Use preferred language in extension i18n"
(commit 693d01a6). Because of some
intervening changes causing more complicated merges, it's simpler to
just undo the side effects of the original change, leaving the changed
boilerplate intact.

Reason for revert: Testing perf regression in crbug.com/898191

If this exonerates the original CL, we will revert this change.
Otherwise, we will clean up the boilerplate added for the original CL.

Original change's description:
> Use preferred language in extension i18n
>
> When localizing an extension, prioritize the user's preferred language
> over the application locale.
>
> Normally, these are the same. In some cases, they differ. For example,
> the user may choose to display Chrome in "en-CA" (the intl.app_locale
> pref), but because we don't have translations for that, the actual
> UI locale is "en-GB".
>
> This CL makes extensions try to use the user's preferred locale for i18n
> ("en_CA"), falling back to the UI locale ("en_GB") if no locale
> directory is found for the preferred locale.
>
> This change also updates the "current_locale" manifest key to reflect
> the user's preferred locale, or the UI locale if intl.app_locale is
> unset.
>
> Note: Like the application locale, the preferred locale is only set at
> startup (and in certain situations in CrOS). If the user changes their
> intl.app_locale pref, they have to restart Chrome before extensions are
> re-localized, just like before.
>
> Bug: 874225
> Change-Id: I1aabe3c3680b77d6522193e764aec15a3d618d2d
> Reviewed-on: https://chromium-review.googlesource.com/c/1244666
> Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#600619}

Bug: 898191
Change-Id: Iaddceb16d61ffc5572a25ed31276443ea5b5baa4
Reviewed-on: https://chromium-review.googlesource.com/c/1308765Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604819}