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This makes a slight change to error messages: notably, we no longer
explicitly check if the URL is same origin with the document URL (which
is implied by being within scope), hence same-origin errors are now
reported as not-within-scope errors.

Bug: 1101909, 1101910, 1101911, 1101912
Change-Id: I492688f667d7cd351bbc1dfe1ce39d5276d9fa93
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2280961Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Commit-Queue: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785285}