Make the implicit constructor private for zone, handlescope and nohandlescope classes.

vm/allocation.h

 // Copyright (c) 2011, 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.
 
 #ifndef VM_ALLOCATION_H_
 #define VM_ALLOCATION_H_
 
 #include "vm/assert.h"
 
 namespace dart {
@@ skipping 32 matching lines @@
   // The delete operator should be private instead of public, but unfortunately
   // the compiler complains when compiling the destructors for subclasses.
   void operator delete(void* pointer) { UNREACHABLE(); }
 
  private:
   Isolate* isolate_;  // Current isolate for this stack resource.
   StackResource* previous_;
 
   void* operator new(uword size);
 
-  DISALLOW_COPY_AND_ASSIGN(StackResource);
+  DISALLOW_IMPLICIT_CONSTRUCTORS(StackResource);
 };
 
 
 // Static allocated classes only contain static members and can never
 // be instantiated in the heap or on the stack.
 class AllStatic {
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(AllStatic);
 };
@@ skipping 22 matching lines @@
   // deallocated by invoking DeleteAll() on the zone they live in.
   void operator delete(void* pointer) { UNREACHABLE(); }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ZoneAllocated);
 };
 
 }  // namespace dart
 
 #endif  // VM_ALLOCATION_H_