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

src/vm/refcounted.h

Index: src/vm/refcounted.h
diff --git a/src/vm/refcounted.h b/src/vm/refcounted.h
index a69cbca9465ebb1d55f11ab4fce836b5adb8b4fc..3f7f91b9331f284f141755b50c0b20e1bd07ab63 100644
--- a/src/vm/refcounted.h
+++ b/src/vm/refcounted.h
@@ -30,12 +30,6 @@ class Refcounted {
     }
   }
 
- protected:
-  bool DecrementRefWithoutDelete() {
-    ASSERT(ref_count_ > 0);
-    return --ref_count_ == 0;
-  }
-
  private:
   Atomic<int> ref_count_;
 };