Undeprecate Persistent::ClearAndLeak

We depend on this in blink, and won't be able to replace it in
the near future

R=svenpanne@google.com, svenpanne@chromium.org
BUG=none
LOG=n

Review URL: https://codereview.chromium.org/95003004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18128 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

include/v8.h

@@ -734,8 +734,8 @@ template <class T, class M> class Persistent : public PersistentBase<T> {
           P* parameter,
           typename WeakReferenceCallbacks<T, P>::Revivable callback));
 
-  V8_DEPRECATED("This will be removed",
-                V8_INLINE T* ClearAndLeak());
+  // This will be removed.
+  V8_INLINE T* ClearAndLeak();
 
   V8_DEPRECATED("This will be removed",
                 V8_INLINE void Clear()) { this->val_ = 0; }