Make v8::TryCatch able to consume natively thrown exceptions (again).

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 382cb5dbb13156ab5d8b886bbd1293bd9652dd76..ca2c23ea74d70f4eb697286dcc77c09e65b9567b 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -735,6 +735,8 @@ class Isolate {
   // Re-set pending message, script and positions reported to the TryCatch
   // back to the TLS for re-use when rethrowing.
   void RestorePendingMessageFromTryCatch(v8::TryCatch* handler);
+  // Un-schedule an exception that was caught by a TryCatch handler.
+  void CancelScheduledExceptionFromTryCatch(v8::TryCatch* handler);
   void ReportPendingMessages();
   // Return pending location if any or unfilled structure.
   MessageLocation GetMessageLocation();