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Only PaintLayerPaintingOverlayScrollbars is actually ever set to a different value in different codepaths. -PaintLayerHaveTransparency can just be replaced with isTransparent() calls. -PaintLayerPaintingCompositingScrollingPhase is unused. -PaintLayerPaintingCompositingAllPhases is always set, which means that the other three compositing ones are also always set. The third bullet more clearly falls out when you see that the only caller of paintLayerContents is paintLayerContentsAndReflection, which sets PaintLayerPaintingCompositingAllPhases on the paint flags. Get rid of paintLayerContentsAndReflection since we no longer have reflections. The rest of the changes are all just propagating the now always false or true booleans in paintLayerContents. R=eseidel@chromium.org Review URL: https://codereview.chromium.org/778883002