Merge the 3 different closure nodes into a single node.

runtime/vm/ast_printer.cc

Index: runtime/vm/ast_printer.cc
===================================================================
--- runtime/vm/ast_printer.cc	(revision 482)
+++ runtime/vm/ast_printer.cc	(working copy)
@@ -267,20 +267,6 @@
 }
 
 
-void AstPrinter::VisitImplicitStaticClosureNode(
-    ImplicitStaticClosureNode* node) {
-  const char* function_fullname = node->function().ToFullyQualifiedCString();
-  OS::Print("static (%s '%s')", node->Name(), function_fullname);
-}
-
-
-void AstPrinter::VisitImplicitInstanceClosureNode(
-    ImplicitInstanceClosureNode* node) {
-  const char* function_fullname = node->function().ToFullyQualifiedCString();
-  OS::Print("(%s '%s')", node->Name(), function_fullname);
-}
-
-
 void AstPrinter::VisitClosureCallNode(ClosureCallNode* node) {
   VisitGenericAstNode(node);
 }