Bugfix in process handle: Do detaching from owner process separately from derefing.

src/vm/refcounted.h

 // Copyright (c) 2015, the Fletch 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.md file.
 
 #ifndef SRC_VM_REFCOUNTED_H_
 #define SRC_VM_REFCOUNTED_H_
 
 #include "src/shared/globals.h"
 #include "src/shared/atomic.h"
 
@@ skipping 12 matching lines @@
     ref_count_++;
   }
 
   static void DecrementRef(T* object) {
     ASSERT(object->ref_count_ > 0);
     if (--object->ref_count_ == 0) {
       delete reinterpret_cast<T*>(object);
     }
   }
 
- protected:
-  bool DecrementRefWithoutDelete() {
-    ASSERT(ref_count_ > 0);
-    return --ref_count_ == 0;
-  }
-
  private:
   Atomic<int> ref_count_;
 };
 
 }  // namespace fletch
 
 #endif  // SRC_VM_REFCOUNTED_H_