Nuked unused method declaration.

Review URL: http://codereview.chromium.org/7841030

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9161 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen.h

@@ -855,7 +855,6 @@ class HGraphBuilder: public AstVisitor {
                            TypeInfo info,
                            HValue* value,
                            Representation rep);
-  void AssumeRepresentation(HValue* value, Representation rep);
   static Representation ToRepresentation(TypeInfo info);
 
   void SetupScope(Scope* scope);