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This way the diff output is the same whether or not the diff was cached.

Change-Id: I14428725408d6cf49ae570d269849d6b0b7e1a35
Reviewed-on: https://chromium-review.googlesource.com/979232Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545794}