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It's used only in a single file, so define it there
(condition_variable_posix.cc).

Bug: None
Change-Id: Ia59b42486feee2920f77dbcbef40a0d801bd2b51
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2405416
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806374}