Fix for 23623 added two new methods (setShouldIncludeChildWindows and shouldIncludeChildWindows) to the GraphicsContext for Windows builds, but only defined them for the CG Windows build.
This patch moves the implementation from GraphicsContextCG to GraphicsContextWin, where the Cairo and CG builds can use them.
Created attachment 27257 [details]
Move common code up in the hierarchy to clean up implementation and resolve build issue.
Committed in r40490.