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It is safe to access layout after a call to HandleLayoutComplete(), and
it should be done as soon as possible.

Exactly what leads to the fatal errors should still be investigated
anyway, but this is a simple fix and we still a way to repro.

Bug: 1131848,1125186
Change-Id: Ia529928fdee731f9fcf81d65a80edb49aadee9fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436418
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Auto-Submit: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811553}