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Reland "Removed BrowserView::ViewHierarchChanged, moved most code to constructor and widget-specfic code to AddedToWidget."

This is a reland of f3616c26

Original change's description:
> Removed BrowserView::ViewHierarchChanged, moved most code to constructor and widget-specfic code to AddedToWidget.
> 
> Bug: 245409
> Change-Id: I1e606548df4361199862c561ad86f4d40cbaa7df
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1979098
> Commit-Queue: Allen Bauer <kylixrd@chromium.org>
> Reviewed-by: Peter Kasting <pkasting@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#728998}

Bug: 245409
Change-Id: Id5317849e130ec8715200f0947bc01f2bc932842
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1991945
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729914}