Do not export natives to runtime via js builtins object.

src/messages.js

Index: src/messages.js
diff --git a/src/messages.js b/src/messages.js
index 719c3877a51c9fdabde4541a63e00ac0b0bcf491..0d2d3d40f2acd3a51ee3c098ea6690ff4b922a56 100644
--- a/src/messages.js
+++ b/src/messages.js
@@ -1015,7 +1015,6 @@ utils.InstallFunctions(GlobalError.prototype, DONT_ENUM,
                        ['toString', ErrorToString]);
 
 $errorToString = ErrorToString;
-$getStackTraceLine = GetStackTraceLine;
 $messageGetPositionInLine = GetPositionInLine;
 $messageGetLineNumber = GetLineNumber;
 $messageGetSourceLine = GetSourceLine;
@@ -1076,4 +1075,8 @@ captureStackTrace = function captureStackTrace(obj, cons_opt) {
 
 GlobalError.captureStackTrace = captureStackTrace;
 
+utils.ExportToRuntime(function(to) {
+  to.GetStackTraceLine = GetStackTraceLine;
+});
+
 });