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A previous fix attempted to remove some warnings. Some source_sets were
not using the private_config needed to build. Adding the private_config.

Bug: 1152807
Test: CQ
Change-Id: I8f8f4a74affd161e7a39a99e43a8060d8421b4a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566371
Auto-Submit: Andres Medina <medinaandres@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832120}