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This only affects profiling builds (coverage or PGO)

There's already some logic to wait for all the renderer processes to
dump their profiling data on shutdown but this doesn't cover the utility
processes and they end up corrupting some profile data files. This CL
extends the logic that we already use for the renderer and GPU processes
to the other childs.

Bug: 1071664, 1124774
Change-Id: I64a1fa247226a3521efc6680bb103c15f7b37cc0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2399819Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805460}