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Update the condition here to be consistent with cdm_paths.gni. Also
update the comments to make sure they keep consistent.

Bug: 1128458
Change-Id: I7580d30637f9aae2d856846d74e086c64a2f123d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2417137Reviewed-by: John Rummell <jrummell@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808070}