Remove extraneous -expected.xht files from WebKit exports (#47349)
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Delete css/css-backgrounds/color-mix-currentcolor-outline-repaint-expected.xht
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Delete css/css-backgrounds/color-mix-currentcolor-background-repaint-expected.xht
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Delete css/css-backgrounds/color-mix-currentcolor-outline-repaint-parent-expected.xht
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Delete css/css-backgrounds/color-mix-currentcolor-background-repaint-parent-expected.xht