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The COEP reporting feature has two observable effects. User agents send
reports to the network, and web developers can observe reports via
ReportingObserver. We need to have *some* tests for each way, but we
don't need to have all the test cases for both ways.

As the ReportingObserver way is faster, easier to debug and less flaky,
we would like to test more cases with ReportingObserver. This CL moves
many test cases from reporting.https.html to
reporting-navigation.https.html and
reporting-subresource-corp.https.html, and rename reporting.https.html
to reporting-to-endpoint.https.html. This CL also removes many
duplicated tests (see reporting-subresource-corp.https.html).

Bug: 1052764
Change-Id: I37a567d8cbb6aec79a8426f2f32630c70e4da112
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208154
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770058}