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This CL tests that we don't continue manifest updating when the site has
an invalid manifest.

Bug: 926083
Change-Id: I902b828e50f6ec3b32cf254cda9d55a0b1f2729f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1831659Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701074}