Cleanup change.

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_OBJECT_H_
 #define RUNTIME_VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 2181 matching lines @@
   RawType* SignatureType() const;
 
   // Update the signature type (with a canonical version).
   void SetSignatureType(const Type& value) const;
 
   // Build a string of the form 'C<T, R>(T, {B b, C c}) => R' representing the
   // internal signature of the given function. In this example, T and R are
   // type parameters of class C, the owner of the function.
   RawString* Signature() const {
     const bool instantiate = false;
-    return BuildSignature(instantiate, kInternalName, TypeArguments::Handle());
+    return BuildSignature(instantiate, kInternalName,
+                          Object::null_type_arguments());
   }
 
   // Build a string of the form '(T, {B b, C c}) => R' representing the
   // user visible signature of the given function. In this example, T and R are
   // type parameters of class C, the owner of the function, also called the
   // scope class of the function type.
   // Implicit parameters are hidden, as well as the prefix denoting the
   // scope class and its type parameters.
   RawString* UserVisibleSignature() const {
     const bool instantiate = false;
     return BuildSignature(instantiate, kUserVisibleName,
-                          TypeArguments::Handle());
+                          Object::null_type_arguments());
   }
 
   // Build a string of the form '(A, {B b, C c}) => D' representing the
   // signature of the given function, where all generic types (e.g. '<T, R>' in
   // 'C<T, R>(T, {B b, C c}) => R') are instantiated using the given
   // instantiator type argument vector of a C instance (e.g. '<A, D>').
   RawString* InstantiatedSignatureFrom(const TypeArguments& instantiator,
                                        NameVisibility name_visibility) const {
     const bool instantiate = true;
     return BuildSignature(instantiate, name_visibility, instantiator);
@@ skipping 6724 matching lines @@
 
 inline void TypeArguments::SetHash(intptr_t value) const {
   // This is only safe because we create a new Smi, which does not cause
   // heap allocation.
   StoreSmi(&raw_ptr()->hash_, Smi::New(value));
 }
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_OBJECT_H_