Remove signature classes from the VM.

runtime/vm/debugger_api_impl.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_tools_api.h"
 
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
@@ skipping 653 matching lines @@
                             Dart_Handle* name,
                             Dart_Handle* signature,
                             Dart_CodeLocation* location) {
   DARTSCOPE(Thread::Current());
   UNWRAP_AND_CHECK_PARAM(Instance, instance, closure);
   CHECK_NOT_NULL(location);
 
   if (!instance.IsClosure()) {
     return Api::NewError("%s: parameter 0 is not a closure", CURRENT_FUNC);
   }
-  const Function& func = Function::Handle(Closure::function(instance));
+  const Function& func = Function::Handle(Closure::Cast(instance).function());
   ASSERT(!func.IsNull());
   if (name != NULL) {
     *name = Api::NewHandle(T, func.QualifiedUserVisibleName());
   }
   if (signature != NULL) {
     *signature = Api::NewHandle(T, func.UserVisibleSignature());
   }
 
   if (location != NULL) {
     if (func.token_pos() >= 0) {
@@ skipping 269 matching lines @@
   return Api::CastIsolate(isolate);
 }
 
 
 DART_EXPORT Dart_IsolateId Dart_GetIsolateId(Dart_Isolate dart_isolate) {
   Isolate* isolate = reinterpret_cast<Isolate*>(dart_isolate);
   return isolate->debugger()->GetIsolateId();
 }
 
 }  // namespace dart