VideoCommon: flush vertex manager if components change

Source/Core/VideoCommon/NativeVertexFormat.h

@@ -114,9 +114,6 @@ public:
 	u32 GetVertexStride() const { return vtx_decl.stride; }
 	const PortableVertexDeclaration& GetVertexDeclaration() const { return vtx_decl; }
 
-	// TODO: move this under private:
-	u32 m_components;  // VB_HAS_X. Bitmask telling what vertex components are present.
-
 protected:
 	// Let subclasses construct.
 	NativeVertexFormat() {}