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Update comments to clarify how the child process log interacts with
ScopedLogging.

Use the new class to capture logs in cleaner_test.cc,
secure_dll_loading_test.cc and proto_chrome_prompt_ipc_unittest.cc.

R=proberge

Bug: 1030333
Change-Id: I88f538ff360bb8ed9da6743dc5d6c4b263af992c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947986
Commit-Queue: Joe Mason <joenotcharles@chromium.org>
Reviewed-by: proberge <proberge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721184}