Bug 1934988 [wpt PR 49500] - RunResizeObserverSteps() for all frames., a=testonly

Automatic update from web-platform-tests
RunResizeObserverSteps() for all frames.

RunResizeObserverSteps() used to NotifyResizeObservers() for all frames,
but RunResizeObserverSteps() was only performed on the root frame, which
caused trouble for some mechanisms when inside iframes:

1. Forgetting the size of disconnected elements.
Test: forget-on-disconnect-in-iframe.html , which is based on
auto-006.html

2. Updating the last successful position fallback.
Test: last-successful-iframe.html is based on last-successful-basic.html

3. Default anchor scroll shift.
Test: position-area-scrolling-003.tentative.html

Bug: 373874012
Change-Id: I39657685689d41b7ae1f15d31aaf61e05f1ee9c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6063590
Reviewed-by: Rune Lillesveen <futharkchromium.org>
Commit-Queue: Morten Stenshorne <mstenshochromium.org>
Reviewed-by: Vladimir Levin <vmpstrchromium.org>
Cr-Commit-Position: refs/heads/main{#1391245}

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wpt-commits: 0c731ef8f1f3a691e433227201fdd4752b6242f3
wpt-pr: 49500

UltraBlame original commit: 6a2ea281b24f9f864238810628f98feeec510515

Author: marco-c