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The widget host is unexpectedly initialized when we go to initialize
the view. So, check at the earliest stage possible if the widget host
is already initialized. If it's not, then finding out when and how it
flips should be easy.

Bug: 1006814
Change-Id: I0a592c9411323ef8966357da960e347cb2647d51
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2100588
Commit-Queue: Fergal Daly <fergal@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749962}