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Verifying presence of CORS console message in tests.

This CL modifies tests that expect that a request is blocked by CORS.
Before this CL, such tests would only verify that the request errored
out (which can happen for non-CORS related reasons - see
https://crbug.com/1051594#c9).  After this CL, such tests also verify
that CORS emitted an error message to the console.

Bug: 1051594
Change-Id: I0230e915e56398a70cd511fc7febe39d264e4a23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2137851
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758302}