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In BridgedContentView, change most calls that refer to the views::View
hostedView_ to be routed through the BridgedNativeWidgetHost interface.

Leave keyboard events, text input, and a11y unchanged for now.

Add a BridgedNativeWidgetHostImpl::SetRootLayer method which now calls
through to BridgedNativeWidget::SetRootLayer. Once the remaining uses
of hostedView_ are removed, the BridgedNativeWidget::SetRootLayer method
will be removed.

Bug: 859152
Change-Id: I2a010b3149357af4f9aeaec0088eb9fcde53db13
Reviewed-on: https://chromium-review.googlesource.com/1168459
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581960}