[Cairo][Win] Remove unneeded GraphicsContextPlatformPrivate
GraphicsContextPlatformPrivate syncs HDC's transform with
GraphicsContext's transform. However, WinCairo doesn't use it.
Created attachment 433201 [details]
Comment on attachment 433201 [details]
Clearing flags on attachment: 433201
Committed r279794 (239561@main): <https://commits.webkit.org/239561@main>
All reviewed patches have been landed. Closing bug.
*** Bug 227827 has been marked as a duplicate of this bug. ***