Gentle start with removing explicit interfaces

runtime/vm/raw_object.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/raw_object.h"
 
 #include "vm/class_table.h"
 #include "vm/freelist.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 922 matching lines @@
 
 intptr_t RawExternalFloat64Array::VisitExternalFloat64ArrayPointers(
     RawExternalFloat64Array* raw_obj, ObjectPointerVisitor* visitor) {
   // Make sure that we got here with the tagged pointer as this.
   ASSERT(raw_obj->IsHeapObject());
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
   return ExternalFloat64Array::InstanceSize();
 }
 
 
+intptr_t RawDartFunction::VisitDartFunctionPointers(
+    RawDartFunction* raw_obj, ObjectPointerVisitor* visitor) {
+  // Function (defined in core library) is an abstract class.
+  UNREACHABLE();
+  return 0;
+}
+
+
 intptr_t RawClosure::VisitClosurePointers(RawClosure* raw_obj,
                                           ObjectPointerVisitor* visitor) {
   // Make sure that we got here with the tagged pointer as this.
   ASSERT(raw_obj->IsHeapObject());
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
   return Closure::InstanceSize();
 }
 
 
 intptr_t RawStacktrace::VisitStacktracePointers(RawStacktrace* raw_obj,
@@ skipping 17 matching lines @@
 
 intptr_t RawWeakProperty::VisitWeakPropertyPointers(
     RawWeakProperty* raw_obj, ObjectPointerVisitor* visitor) {
   // Make sure that we got here with the tagged pointer as this.
   ASSERT(raw_obj->IsHeapObject());
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
   return WeakProperty::InstanceSize();
 }
 
 }  // namespace dart