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WindowsSpellChecker::GetSupportedWindowsPreferredLanguages is only
used in a unit test. The plan to support toggling on spellchecking
for languages such as Arabic that have Windows spellcheck dictionaries
but not Hunspell dictionaries has changed. We will now use the
ISpellCheckerFactory::get_SupportedLanguages spellchecker API to get a
list of installed Windows dictionaries, which will supplement the
hardcoded list of Hunspell languages (future CL).

See following for discussion:

Windows Spellcheck: Should only be performed for the preferred
languages listed in Windows settings
https://bugs.chromium.org/p/chromium/issues/detail?id=1000443#c20

Bug: 1000443
Change-Id: I49c220ca76ff2991ee79b6184bc0616724a97267
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2079651Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Bruce Long <brlong@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#745448}