Fix owner of mixin forwarding constructors

runtime/vm/parser.cc

Index: runtime/vm/parser.cc
diff --git a/runtime/vm/parser.cc b/runtime/vm/parser.cc
index 15393a0d0b41b74017becaeb4d9af45f9354077c..09dab6cfb548cb1423f67b9de9b0e02d6b14ebf3 100644
--- a/runtime/vm/parser.cc
+++ b/runtime/vm/parser.cc
@@ -2581,8 +2581,7 @@ AstNode* Parser::ParseExternalInitializedField(const Field& field) {
 
   set_current_class(Class::Handle(Z, field.origin()));
   set_library(Library::Handle(Z, current_class().library()));
-  SetScript(Script::Handle(Z, current_class().script()),
-            field.token_pos());
+  SetScript(Script::Handle(Z, current_class().script()), field.token_pos());
 
   ASSERT(IsIdentifier());
   ConsumeToken();