- Use NoHandleScope in leaf methods

vm/handles.h

Index: vm/handles.h
===================================================================
--- vm/handles.h	(revision 8879)
+++ vm/handles.h	(working copy)
@@ -299,19 +299,21 @@
 class NoHandleScope : public StackResource {
  public:
   explicit NoHandleScope(BaseIsolate* isolate);
+  NoHandleScope();
   ~NoHandleScope();
 
  private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(NoHandleScope);
+  DISALLOW_COPY_AND_ASSIGN(NoHandleScope);
 };
 #else  // defined(DEBUG)
 class NoHandleScope : public ValueObject {
  public:
   explicit NoHandleScope(BaseIsolate* isolate) { }
+  NoHandleScope() { }
   ~NoHandleScope() { }
 
  private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(NoHandleScope);
+  DISALLOW_COPY_AND_ASSIGN(NoHandleScope);
 };
 #endif  // defined(DEBUG)