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This CL removes BlockUntilWindowMapped() and the 2 references to it.

The first reference, in X11WholeScreenMoveLoop, waits until an offscreen window
is mapped.  The window is override-redirect (so there's not WM that
asynchronously decides when to map the window), so any operations done on the
window should succeed after the window is mapped since the X server processes
events in sequence.

The second reference is from X11WindowBase.  A similar removal was done in
DesktopWindowTreeHostX11 in [1], so BlockUntilWindowMapped() shouldn't be needed
here either.

[1] https://chromium.googlesource.com/chromium/src/+/662c24fc6debb33ee34a927d21dc26154b8973d6

R=sadrul@chromium.org

Change-Id: I251e67839dd5216f5164a103a82ad8a906811a03
Bug: None
Reviewed-on: https://chromium-review.googlesource.com/823212
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#525869}