Remove signature classes from the VM.

runtime/vm/debugger.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/debugger.h"
 
 #include "include/dart_api.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 2126 matching lines @@
   } else {
     return bpt_location->AddRepeated(this);
   }
 }
 
 
 Breakpoint* Debugger::SetBreakpointAtActivation(const Instance& closure) {
   if (!closure.IsClosure()) {
     return NULL;
   }
-  const Function& func = Function::Handle(Closure::function(closure));
+  const Function& func = Function::Handle(Closure::Cast(closure).function());
   const Script& script = Script::Handle(func.script());
   BreakpointLocation* bpt_location = SetBreakpoint(script,
                                                    func.token_pos(),
                                                    func.end_token_pos(),
                                                    -1, -1 /* no line/col */);
   return bpt_location->AddPerClosure(this, closure);
 }
 
 
 Breakpoint* Debugger::BreakpointAtActivation(const Instance& closure) {
@@ skipping 1085 matching lines @@
 }
 
 
 void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
   ASSERT(bpt->next() == NULL);
   bpt->set_next(code_breakpoints_);
   code_breakpoints_ = bpt;
 }
 
 }  // namespace dart