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display::Screen (and ScreenMus) now has the display for new windows,
so we can use that when making new browser windows under both mash
and classic ash. Likewise, we can use display::Screen (as ScreenAsh)
for new windows inside of ash.

This lets me remove ShellStateClient, a different mechanism that
accomplishes the same goal in a less general way.

Leave ash::ShellState for now. I will clean that up in a separate CL.

TBR=tsepez@chromium.org

Bug: 764009
Test: existing browser_tests for browser frame/size
Change-Id: I5c255dc2bf8fdd48f519f148d29aca3d37e7ae73
Reviewed-on: https://chromium-review.googlesource.com/1168197Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582336}