Make ImmutableArray a sub class of AllStatic.

runtime/vm/raw_object_snapshot.cc

 // 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.
 
 #include "vm/bigint_operations.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/snapshot.h"
 #include "vm/symbols.h"
 #include "vm/visitor.h"
@@ skipping 2064 matching lines @@
 
 
 RawImmutableArray* ImmutableArray::ReadFrom(SnapshotReader* reader,
                                             intptr_t object_id,
                                             intptr_t tags,
                                             Snapshot::Kind kind) {
   ASSERT(reader != NULL);
 
   // Read the length so that we can determine instance size to allocate.
   intptr_t len = reader->ReadSmiValue();
-  ImmutableArray* array = reinterpret_cast<ImmutableArray*>(
-      reader->GetBackRef(object_id));
+  Array* array = reinterpret_cast<Array*>(reader->GetBackRef(object_id));
   if (array == NULL) {
-    array = &(ImmutableArray::ZoneHandle(
+    array = &(Array::ZoneHandle(
         reader->isolate(),
         NEW_OBJECT_WITH_LEN_SPACE(ImmutableArray, len, kind)));
     reader->AddBackRef(object_id, array, kIsDeserialized);
   }
   reader->ArrayReadFrom(*array, len, tags);
-  return array->raw();
+  return raw(*array);
 }
 
 
 void RawArray::WriteTo(SnapshotWriter* writer,
                        intptr_t object_id,
                        Snapshot::Kind kind) {
   writer->ArrayWriteTo(object_id,
                        kArrayCid,
                        writer->GetObjectTags(this),
                        ptr()->length_,
@@ skipping 535 matching lines @@
   // Write out the class and tags information.
   writer->WriteIndexedObject(kWeakPropertyCid);
   writer->WriteIntptrValue(writer->GetObjectTags(this));
 
   // Write out all the other fields.
   writer->Write<RawObject*>(ptr()->key_);
   writer->Write<RawObject*>(ptr()->value_);
 }
 
 }  // namespace dart