GitLab

On CrOS the global performance manager instance isn't available when
this gets created.

Change-Id: I082a1fae17665f10eab87a211157d4c969d1d238
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1704716Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678365}