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With this, no checksum is required for config.js anymore, which fixes a
race condition between serving the checksum and serving the contents
themselves. It also lets us remove quite a lot of plumbing :)

Bug: 792490, 791969
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I609ef274325bddb49bcbe6e90d58d35b7a385920
Reviewed-on: https://chromium-review.googlesource.com/811185
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Chris Pickel <sfiera@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522428}