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This adds a (default enabled) feature AppCacheAlwaysFallbackToNetwork,
when enabled chrome will behave as if every manifest file included a
NETWORK: * line, indicating that all requests should fall back to the
network.

Bug: 1152226
Change-Id: I02f126a91d7061183274a66ad759cde58da533cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2594235Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843607}