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No behavior change expected.

compile_resources.py takes almost exclusively build intermediates as
inputs (all except for link config, which rarely changes), and so
md5_check was just adding complexity & overhead.

Adding AtomicOutput should improve robustness & reduce overbuilds in a
more effective way, as well as protect against Ctrl-C at unfortunate
times.

Change-Id: Iee179fb3b693e8f2b98399b365537ff7aec27b13
Reviewed-on: https://chromium-review.googlesource.com/c/1436736
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626164}