Explicitly whitelist 'blob:' and 'filesystem:' for built-in extensions.

This CL is brought to you by opening all the 'manifest.json' files
outside of test directories that contain 'content_security_policy' keys,
and executing `:%s/'self'/'self' blob: filesystem:/g` on each.

Next time I'll write a bash script. :/

BUG=473904
R=jochen@chromium.org
TBR=fukino@chromium.org

Review URL: https://codereview.chromium.org/1176203008

Cr-Commit-Position: refs/heads/master@{#334836}
21 files changed