Get rid of PaintBehaviorSelectionOnly.

sky/engine/core/rendering/PaintPhase.h

Index: sky/engine/core/rendering/PaintPhase.h
diff --git a/sky/engine/core/rendering/PaintPhase.h b/sky/engine/core/rendering/PaintPhase.h
index 4d9fb56114d7d7e542f149d65df90db84b4f3d28..c4570dc0fa04e15a8ad8de5d916aa9e98bc81ab9 100644
--- a/sky/engine/core/rendering/PaintPhase.h
+++ b/sky/engine/core/rendering/PaintPhase.h
@@ -53,11 +53,10 @@ enum PaintPhase {
 
 enum PaintBehaviorFlags {
     PaintBehaviorNormal = 0,
-    PaintBehaviorSelectionOnly = 1 << 0,
+    // FIXME(sky): Renumber these once we're done deleting them.
     PaintBehaviorForceBlackText = 1 << 1,
     // FIXME(sky): This is unused. Remove it.
     PaintBehaviorFlattenCompositingLayers = 1 << 2,
-    PaintBehaviorRenderingSVGMask = 1 << 3,
     PaintBehaviorSkipRootBackground = 1 << 4,
     PaintBehaviorRootBackgroundOnly = 1 << 5
 };