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Creating a new window for a tab playing media shows the medial toolbar
button immediately. With a recent change, it would then attempt to get
the window's BrowserView. But BrowserView::GetBrowserViewForBrowser()
returns nullptr when called during BrowserView construction resulting
in a crash.

This CL changes MediaToolbarButtonView to take the BrowserView on
construction instead.

Fixed: 1130921, 1130897
Change-Id: Ica879fe9825c4ef1af2789169bffb49da28370b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423551Reviewed-by: Abigail Klein <abigailbklein@google.com>
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809365}