DevTools: Fix console output for native functions like Math.random

Source/devtools/front_end/ConsoleView.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 601 matching lines @@
             if (error) {
                 console.error(error);
                 addMessage.call(this);
                 return;
             }
 
             var url;
             var lineNumber;
             var columnNumber;
             var script = WebInspector.debuggerModel.scriptForId(response.location.scriptId);
-            console.assert(script);
-            if (script.sourceURL) {
+            if (script && script.sourceURL) {
                 url = script.sourceURL;
                 lineNumber = response.location.lineNumber + 1;
                 columnNumber = response.location.columnNumber + 1;
             }
             addMessage.call(this, url, lineNumber, columnNumber);
         }
     },
 
     /**
      * @param {string} text
@@ skipping 597 matching lines @@
 
 /**
  * @type {?WebInspector.ConsoleView}
  */
 WebInspector.consoleView = null;
 
 WebInspector.ConsoleMessage.create = function(source, level, message, type, url, line, column, repeatCount, parameters, stackTrace, requestId, isOutdated)
 {
     return new WebInspector.ConsoleMessageImpl(source, level, message, WebInspector.consoleView._linkifier, type, url, line, column, repeatCount, parameters, stackTrace, requestId, isOutdated);
 }