Fix the color difference comparison's handling of alpha#1639
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- If ColorBgra is using premultiplied alpha, this doesn't need to scale by alpha again and can just compute a Euclidean distance as-is - Remove unused ColorDifferenceSquared() method Bug: #1553
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If ColorBgra is using premultiplied alpha, this doesn't need to scale by alpha again and can just compute a Euclidean distance as-is
Remove unused ColorDifferenceSquared() method
Bug: #1553