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Blobs and filesystem URLs are considered "local" schemes by blink;
they can only be requested from processes with permission to
commit them.

Adding this means that we block extension filesystem: URLs via FilterURL
rather than ShouldAllowOpenURL, meaning that the WebAccessibleResource
UMAs don't trigger. Update test expectations to reflect this.

Add a test that exercises an interesting 'noopener' corner case.

Change-Id: Ie0473a4d4034ceb03e6098d524f16ef8d215398e
Bug: 821586, 821596
Reviewed-on: https://chromium-review.googlesource.com/961126Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Nick Carter <nick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543142}