Make ImmutableArray a sub class of AllStatic.

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, 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.
 
 #include "include/dart_api.h"
 
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
@@ skipping 2025 matching lines @@
 
 
 DART_EXPORT Dart_Handle Dart_ListSetAt(Dart_Handle list,
                                        intptr_t index,
                                        Dart_Handle value) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   const Object& obj = Object::Handle(isolate, Api::UnwrapHandle(list));
   // If the list is immutable we call into Dart for the indexed setter to
   // get the unsupported operation exception as the result.
-  if (obj.IsArray() && !obj.IsImmutableArray()) {
+  if (obj.IsArray() && !Array::Cast(obj).IsImmutable()) {
     SET_LIST_ELEMENT(isolate, Array, obj, index, value);
   } else if (obj.IsGrowableObjectArray()) {
     SET_LIST_ELEMENT(isolate, GrowableObjectArray, obj, index, value);
   } else if (obj.IsError()) {
     return list;
   } else {
     CHECK_CALLBACK_STATE(isolate);
 
     // Check and handle a dart object that implements the List interface.
     const Instance& instance =
@@ skipping 233 matching lines @@
       if (Utils::RangeCheck(offset, length, array.Length())) {
         NoGCScope no_gc;
         memmove(reinterpret_cast<uint8_t*>(array.DataAddr(offset)),
                 native_array,
                 length);
         return Api::Success();
       }
       return Api::NewError("Invalid length passed in to access list elements");
     }
   }
-  if (obj.IsArray() && !obj.IsImmutableArray()) {
+  if (obj.IsArray() && !Array::Cast(obj).IsImmutable()) {
     // If the list is immutable we call into Dart for the indexed setter to
     // get the unsupported operation exception as the result.
     SET_LIST_ELEMENT_AS_BYTES(isolate,
                               Array,
                               obj,
                               native_array,
                               offset,
                               length);
   }
   if (obj.IsGrowableObjectArray()) {
@@ skipping 2526 matching lines @@
   }
   {
     NoGCScope no_gc;
     RawObject* raw_obj = obj.raw();
     isolate->heap()->SetPeer(raw_obj, peer);
   }
   return Api::Success();
 }
 
 }  // namespace dart