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This fixes an issue that I caused by my previous patch where file
handlers are not enabled by default, which is incorrect. It also
addresses a few issue that loyso@ found in my previous CL:
https://chromium-review.googlesource.com/c/chromium/src/+/2505685

R=phillis@chromium.org

Bug: 1149981
Change-Id: I70221ff76ef576fb6f09ab89d3db0d90ffe30a60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2544843
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Phillis Tang <phillis@chromium.org>
Auto-Submit: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828348}