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This CL updates a DCHECK to allow for the BrowserNonClientFrameView
getting recreated when the browser window frame is updated via
NonClientView::UpdateFrame().

This also fixes a UI bug where we don't initialise the content setting
icons properly for PWA windows resulting in uninitialised state after
toggling GTK themes.

Before: https://bugs.chromium.org/p/chromium/issues/attachment?aid=365396&signed_aid=Z-gwLwzrT9I5krg3sUoY7Q==&inline=1
After (ignore Linux screen glitching): https://bugs.chromium.org/p/chromium/issues/attachment?aid=365397&signed_aid=e_kvzb_AGaLLi5zzKY_o7w==&inline=1


Bug: 878639
Change-Id: I57bd1a6f7f94687a0f95557914f34eda737129ee
Reviewed-on: https://chromium-review.googlesource.com/c/1308960Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604452}