[DevTools] Fix location.script().sourceURL

third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 319 matching lines @@
     /**
      * @return {!Object.<string, !WebInspector.Script>}
      */
     get scripts()
     {
         return this._scripts;
     },
 
     /**
      * @param {!RuntimeAgent.ScriptId} scriptId
-     * @return {!WebInspector.Script}
+     * @return {?WebInspector.Script}
      */
     scriptForId: function(scriptId)
     {
         return this._scripts[scriptId] || null;
     },
 
     /**
      * @return {!Array.<!WebInspector.Script>}
      */
     scriptsForSourceURL: function(sourceURL)
@@ skipping 575 matching lines @@
 WebInspector.DebuggerModel.Location.prototype = {
     /**
      * @return {!DebuggerAgent.Location}
      */
     payload: function()
     {
         return { scriptId: this.scriptId, lineNumber: this.lineNumber, columnNumber: this.columnNumber };
     },
 
     /**
-     * @return {!WebInspector.Script}
+     * @return {?WebInspector.Script}
      */
     script: function()
     {
         return this._debuggerModel.scriptForId(this.scriptId);
     },
 
     continueToLocation: function()
     {
         this._debuggerModel._agent.continueToLocation(this.payload());
     },
@@ skipping 341 matching lines @@
 /**
  * @param {?WebInspector.Target} target
  * @return {?WebInspector.DebuggerModel}
  */
 WebInspector.DebuggerModel.fromTarget = function(target)
 {
     if (!target || !target.hasJSCapability())
         return null;
     return /** @type {?WebInspector.DebuggerModel} */ (target.model(WebInspector.DebuggerModel));
 }