Remove signature classes from the VM.

runtime/lib/isolate.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 "include/dart_native_api.h"
 #include "platform/assert.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart.h"
 #include "vm/dart_api_impl.h"
@@ skipping 208 matching lines @@
   GET_NON_NULL_NATIVE_ARGUMENT(Instance, message, arguments->NativeArgAt(3));
   GET_NON_NULL_NATIVE_ARGUMENT(Bool, paused, arguments->NativeArgAt(4));
   GET_NATIVE_ARGUMENT(Bool, fatalErrors, arguments->NativeArgAt(5));
   GET_NATIVE_ARGUMENT(SendPort, onExit, arguments->NativeArgAt(6));
   GET_NATIVE_ARGUMENT(SendPort, onError, arguments->NativeArgAt(7));
   GET_NATIVE_ARGUMENT(String, packageRoot, arguments->NativeArgAt(8));
   GET_NATIVE_ARGUMENT(String, packageConfig, arguments->NativeArgAt(9));
 
   if (closure.IsClosure()) {
     Function& func = Function::Handle();
-    func = Closure::function(closure);
+    func = Closure::Cast(closure).function();
     if (func.IsImplicitClosureFunction() && func.is_static()) {
 #if defined(DEBUG)
       Context& ctx = Context::Handle();
-      ctx = Closure::context(closure);
+      ctx = Closure::Cast(closure).context();
       ASSERT(ctx.num_variables() == 0);
 #endif
       // Get the parent function so that we get the right function name.
       func = func.parent_function();
 
       const char* utf8_package_root =
           packageRoot.IsNull() ? NULL : String2UTF8(packageRoot);
       const char* utf8_package_config =
           packageConfig.IsNull() ? NULL : String2UTF8(packageConfig);
 
@@ skipping 201 matching lines @@
   MessageWriter writer(&data, &allocator, false);
   writer.WriteMessage(msg);
 
   PortMap::PostMessage(new Message(port.Id(),
                                    data, writer.BytesWritten(),
                                    Message::kOOBPriority));
   return Object::null();
 }
 
 }  // namespace dart