Revert "Merge of source position information from kernel-sdk."

runtime/vm/exceptions.cc

Index: runtime/vm/exceptions.cc
diff --git a/runtime/vm/exceptions.cc b/runtime/vm/exceptions.cc
index 537b97fdaddd00c4714544c3fbb9cb5d91779342..db0d71024c035b5a7a612f799750706c28f8e0f1 100644
--- a/runtime/vm/exceptions.cc
+++ b/runtime/vm/exceptions.cc
@@ -506,11 +506,12 @@ void Exceptions::CreateAndThrowTypeError(TokenPosition location,
 
   DartFrameIterator iterator;
   const Script& script = Script::Handle(zone, GetCallerScript(&iterator));
-  intptr_t line = -1;
+  intptr_t line;
   intptr_t column = -1;
-  ASSERT(!script.IsNull());
-  if (location.IsReal()) {
+  if (script.HasSource()) {
     script.GetTokenLocation(location, &line, &column);
+  } else {
+    script.GetTokenLocation(location, &line, NULL);
   }
   // Initialize '_url', '_line', and '_column' arguments.
   args.SetAt(0, String::Handle(zone, script.url()));