First pass at removing position:fixed.

sky/engine/core/rendering/style/RenderStyle.h

Index: sky/engine/core/rendering/style/RenderStyle.h
diff --git a/sky/engine/core/rendering/style/RenderStyle.h b/sky/engine/core/rendering/style/RenderStyle.h
index 6ed445a17d28c9c57ad33f5a64b059a20d839c42..6a0528139f2f025712126b60c5cdaf92964ede94 100644
--- a/sky/engine/core/rendering/style/RenderStyle.h
+++ b/sky/engine/core/rendering/style/RenderStyle.h
@@ -408,9 +408,8 @@ public:
     bool hasStaticBlockPosition(bool horizontal) const { return horizontal ? hasAutoTopAndBottom() : hasAutoLeftAndRight(); }
 
     EPosition position() const { return static_cast<EPosition>(noninherited_flags.position); }
-    bool hasOutOfFlowPosition() const { return position() == AbsolutePosition || position() == FixedPosition; }
+    bool hasOutOfFlowPosition() const { return position() == AbsolutePosition; }
     bool hasInFlowPosition() const { return position() == RelativePosition; }
-    bool hasViewportConstrainedPosition() const { return position() == FixedPosition; }
     EFloat floating() const { return static_cast<EFloat>(noninherited_flags.floating); }
 
     const Length& width() const { return m_box->width(); }