remove commented out code in v8.h

TBR=dslomov@chromium.org
BUG=

Review URL: https://codereview.chromium.org/23676007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16591 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

include/v8.h

@@ -544,14 +544,6 @@ template <class T, class M> class Persistent {
     Copy(that);
     return *this;
   }
-  /**
-   * The destructor will dispose the Persistent based on the
-   * kResetInDestructor flags in the traits class.  Since not calling dispose
-   * can result in a memory leak, it is recommended to always set this flag.
-   */
-//  V8_INLINE(~Persistent()) {
-//    if (M::kResetInDestructor) Reset();
-//  }
 
   /**
    * If non-empty, destroy the underlying storage cell