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This matches the CHECK in chrome/app/chrome_main_delegate.cc
with the same message.

These errors are not recoverable, and currently result in a CHECK
being hit later in VariationsService::EnsureLocaleEquals(), which
is trying to guard for locale mismatch issues.

Also expands header comments to mention the empty string return
value being the failure case.

See ResourceBundle::LoadLocaleResources() implementation for the
failure details (i.e. if empty string was returned, we either
didn't load the pack file at all, or got an error loading it).

Bug: 1022934
Change-Id: I4cc670cf669ed824c3b2073586941931fd38e364
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2141010Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758991}