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This mildly reduces the number of platform specific code in files that
are supposed to be cross platform.

R=eroman@chromium.org

Bug: 927182
Change-Id: I854f452ac95a9dbeca326821d7efd9c2ea4c61b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1693565
Commit-Queue: Asanka Herath <asanka@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680094}