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This is a late follow-up to
https://chromium-review.googlesource.com/c/chromium/src/+/1287850 --
since GetChannelName() now depends on GetChannel() being called
previously, call it instead of relying on something else having
called it.

Probably a no-op in practice, but it makes the code more reliable
and look less surprising.

Bug: none
Change-Id: Ie4e2c791db52f590d44d906fb5b0a42f521d427e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1887270
Auto-Submit: Nico Weber <thakis@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710412}