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This CL moves the initialization of the X11Window aka PlatformWindow
to the DWTHPlatform and let the WTHPlatform to own the window instead.

Also, instead of storing of XID in open_windows_, we store
AcceleratedWidget now, which is ok as XID and AcceleratedWidget
have the same type and it has already been used around the code.

In the follow up CLs, I will start moving all the other codes from
DWTHX11 and add extend the existing PlatformWindow interface in
order to be able stop accessing the XWindow directly from the
DWTHX11.

Also, AdjustSize and GetRootTransform have been moved to DWTHPlatform
and declared as protected so that DWTHX11 could access them. What is
more, the ToPixelRect and ToDIPRect have been removed from DWTHX11 as
the DWTHPlatform has already had those methods.

Bug: 990756
Change-Id: I077773fe3154d12696dcbfb606bb3eb3122c0936
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769442
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693093}