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Before every call to an accessibility API on the renderer, we were not checking if the layout tree is clean,
but only if the LayoutView of the document object had a clean layout
which is not the same thing.

Change-Id: If8852842aaf4da06bbb8e65ba495b18c46f82b6a
Bug: 133517108
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1601618Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676445}