a11y: dump the entire tree for all mathml examples In preparation for further work in the platform mappings, expose the full Blink tree in dump accessibility tree tests. Also, remove the dump accessibility node tests that become redundant with this change. R=lucasradaelli@google.com, lucychang@google.com Bug: b/436620270 Test: cq Change-Id: I42e18f84a4a1320134e6469e9ab451f020101b87 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6821899 Reviewed-by: Lucas Radaelli <lucasradaelli@google.com> Commit-Queue: David Tseng <dtseng@chromium.org> Cr-Commit-Position: refs/heads/main@{#1497305}
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