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Also, change IsFullScreenWindowMode to not require the absence of
WS_THICKFRAME when deciding if a window is full screen.

This issue this fixes involves the glass_browser_frame_view when
maximizing after going full screen - an extra 8 pixel bar gets drawn
above a maximized window, and if there's another monitor
above the one with chrome maximized, the bar gets drawn on
the other monitor.

Windows doc
 https://docs.microsoft.com/en-us/windows/win32/winmsg/window-styles
claims that some styles can't be changed after the window is
created, but also says that if you change frame styles, you
need to call SetWindowPos with SWP_FRAMECHANGED, which we are doing.

Not removing the WS_THICKFRAME style doesn't seem to have any visible
effect on full screen windows.

Bug: 1014720
Change-Id: Ibfbd480c603fd7c3aca74081201e99e59fbbbecc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1972258Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791237}