Remove commented out code in GlobalHandles::Node.

src/global-handles.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/global-handles.h"
 
 #include "src/api.h"
 #include "src/cancelable-task.h"
 #include "src/objects-inl.h"
 #include "src/v8.h"
@@ skipping 174 matching lines @@
     DCHECK(state() == WEAK);
     set_state(PENDING);
   }
 
   // Independent flag accessors.
   void MarkIndependent() {
     DCHECK(IsInUse());
     set_independent(true);
   }
 
-  // Callback accessor.
-  // TODO(svenpanne) Re-enable or nuke later.
-  // WeakReferenceCallback callback() { return callback_; }
-
   // Callback parameter accessors.
   void set_parameter(void* parameter) {
     DCHECK(IsInUse());
     parameter_or_next_free_.parameter = parameter;
   }
   void* parameter() const {
     DCHECK(IsInUse());
     return parameter_or_next_free_.parameter;
   }
 
@@ skipping 922 matching lines @@
   blocks_[block][offset] = object;
   if (isolate->heap()->InNewSpace(object)) {
     new_space_indices_.Add(size_);
   }
   *index = size_++;
 }
 
 
 }  // namespace internal
 }  // namespace v8