DevTools: don't fail on advanced search in case opened before workspace is initialized.

Source/devtools/front_end/sources/SourcesSearchScope.js

 /*
  * Copyright (C) 2011 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:
  *
  * 1. Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
@@ skipping 16 matching lines @@
  */
 
 /**
  * @constructor
  * @implements {WebInspector.SearchScope}
  */
 WebInspector.SourcesSearchScope = function()
 {
     // FIXME: Add title once it is used by search controller.
     this._searchId = 0;
-    this._workspace = WebInspector.workspace;
 }
 
 WebInspector.SourcesSearchScope.prototype = {
     /**
      * @param {!WebInspector.Progress} progress
      * @param {function(boolean)} indexingFinishedCallback
      */
     performIndexing: function(progress, indexingFinishedCallback)
     {
         this.stopSearch();
@@ skipping 31 matching lines @@
 
         /**
          * @param {!WebInspector.Project} project
          * @return {boolean}
          */
         function filterOutContentScriptsIfNeeded(project)
         {
             return WebInspector.settings.searchInContentScripts.get() || project.type() !== WebInspector.projectTypes.ContentScripts;
         }
 
-        return this._workspace.projects().filter(filterOutServiceProjects).filter(filterOutContentScriptsIfNeeded);
+        return WebInspector.workspace.projects().filter(filterOutServiceProjects).filter(filterOutContentScriptsIfNeeded);
     },
 
     /**
      * @param {!WebInspector.ProjectSearchConfig} searchConfig
      * @param {!WebInspector.Progress} progress
      * @param {function(!WebInspector.FileBasedSearchResult)} searchResultCallback
      * @param {function(boolean)} searchFinishedCallback
      */
     performSearch: function(searchConfig, progress, searchResultCallback, searchFinishedCallback)
     {
@@ skipping 165 matching lines @@
 
     /**
      * @param {!WebInspector.ProjectSearchConfig} searchConfig
      * @return {!WebInspector.FileBasedSearchResultsPane}
      */
     createSearchResultsPane: function(searchConfig)
     {
         return new WebInspector.FileBasedSearchResultsPane(searchConfig);
     }
 }