Changes in 20201226094423

Built from a7f08169ba3e3cacf831b84271e4ae441b3a0189

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Bug 1682294 R[Core:Layout]Intermittent layout/base/tests/chrome/test_printpreview.xhtml | Printing printpreview_pps_uw4.html and printpreview_pps_uw4_ref.html should produce the same results - got false, expected true
Bug 1684214 R[Core:Layout]Change GetComputedStyleNoFlush to take a const element parameter
Bug 1684110 A[Core:XPCOM]Stop defining aliases for 'A'-functions in windows.h wrapper
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Changes to 3 bugs - 2 fixed.