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Follow-up to commit 5b9b01f7 ("Get the distribution name from os-release
instead of lsb_release").

Borrow the comment from commit e4b86646 ("Store SupportedCodecs in
KeySystemInfo and KeySystems") to explain why we need to have BASE_EXPORT in
both the function's declaration in the header as well as its definition in
the .cc file.

Bug: 420439
Change-Id: I3616fe8a8db138a66e29df1d2debaa022a170404
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1796549
Auto-Submit: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695659}