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This covers the case of a RenderWidgetHost for a subframe, for which we
do not receive View notifications.

Bug: b/148303679
Change-Id: Iaaf6748b0a40e37e83d8b54925666f254a8b392d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037635Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Kevin Schoedel <kpschoedel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738319}