* chore: remove calls to DeprecatedLayoutImmediately
Replace the calls to `DeprecatedLayoutImmediately` that have test
coverage.
- The docked DevTools test added last week covers the three calls in IWCV.
- api-web-contents-view-spec covers the calls from NativeWindow{Views,Mac}.
There are a couple of remaining calls that don't have test coverage yet.
I'll get to them in a followup.
* test: handle both sync or microtask layout
* refactor: add a FlushPendingRootLayout() helper
Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Charles Kerr <charles@charleskerr.com>
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