Revert of Cleanup and unify Isolate::ReportPendingMessages.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index e13409c536a11d7531b5785c9cce6faea3c588db..1fc089d96062f02aef902ffc92b68bae19643004 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -767,16 +767,13 @@
   // finally clause will behave as if the exception were consumed.
   bool PredictWhetherExceptionIsCaught(Object* exception);
 
-  // Propagate pending exception message to potential v8::TryCatch. Also call
-  // message handlers when the exception is guaranteed not to be caught.
-  void ReportPendingMessages();
-
   void ScheduleThrow(Object* exception);
   // 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();
 
@@ -1217,6 +1214,11 @@
                            ThreadLocalTop* archived_thread_data);
 
   void FillCache();
+
+  // Propagate pending exception message to the v8::TryCatch.
+  // If there is no external try-catch or message was successfully propagated,
+  // then return true.
+  bool PropagatePendingExceptionToExternalTryCatch();
 
   // Traverse prototype chain to find out whether the object is derived from
   // the Error object.