Remove position: sticky

Source/core/rendering/style/RenderStyle.h

Index: Source/core/rendering/style/RenderStyle.h
diff --git a/Source/core/rendering/style/RenderStyle.h b/Source/core/rendering/style/RenderStyle.h
index 543c815d06d3b4f7dcecd875e64d39f0c1409312..2eed7f2f5e125785efa78987a040a37bb5e92978 100644
--- a/Source/core/rendering/style/RenderStyle.h
+++ b/Source/core/rendering/style/RenderStyle.h
@@ -471,8 +471,8 @@ public:
 
     EPosition position() const { return static_cast<EPosition>(noninherited_flags._position); }
     bool hasOutOfFlowPosition() const { return position() == AbsolutePosition || position() == FixedPosition; }
-    bool hasInFlowPosition() const { return position() == RelativePosition || position() == StickyPosition; }
-    bool hasViewportConstrainedPosition() const { return position() == FixedPosition || position() == StickyPosition; }
+    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(); }