[M96 Merge]Fix coop reporter not inheriting reporting source.

- Previously we overwrite coop reporter's reporting source in the
  RFHI::SetCrossOriginOpenerPolicyReporter() method called from
  RFHI::TakeNewDocumentPropertiesFromNavigation().
- This has the unintended side effect: RFHI::CreateNewWindow()
  also calls SetCrossOriginOpenerPolicyReporter on a new rfh instance
  to inherit the coop reporter on main frame. Unfortunately this
  overwrites the just initialized coop reporter with the new frame's
  reporting source, which has no reporting-endpoints configured.
- As a result we're not seeing COOP reports from opener document after
  the document is committed to the new window.
- This CL addresses the issue by moving the overwriting logic to
  RFHI::TakeNewDocumentPropertiesFromNavigation(), where it's called
  only when we move the coop reporter used in NavigationRequest to RFHI.
- Added a new browsertest case that ensures coop reports is successfully
  uploaded from opener document's coop reporter.

(cherry picked from commit 74e1a068995488f6fa3b3d4d12d793a235a9228c)

Bug: 1258121
Change-Id: I705e61eecc78a5a2afefaded90dad4223513aeb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3256381
Commit-Queue: Rodney Ding <rodneyding@google.com>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#937713}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3298435
Auto-Submit: Rodney Ding <rodneyding@google.com>
Owners-Override: Srinivas Sista <srinivassista@chromium.org>
Reviewed-by: Srinivas Sista <srinivassista@chromium.org>
Cr-Commit-Position: refs/branch-heads/4664@{#1145}
Cr-Branched-From: 24dc4ee75e01a29d390d43c9c264372a169273a7-refs/heads/main@{#929512}

• content/browser/net/cross_origin_opener_policy_reporting_browsertest.cc[diff]
• content/browser/renderer_host/render_frame_host_impl.cc[diff]