DevTools: Search across files should work for file:folderName queries.

Source/devtools/front_end/sdk/ContentProviderBasedProjectDelegate.js

 /*
  * Copyright (C) 2013 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 199 matching lines @@
      * @param {function(!Array.<!WebInspector.ContentProvider.SearchMatch>)} callback
      */
     searchInFileContent: function(path, query, caseSensitive, isRegex, callback)
     {
         var contentProvider = this._contentProviders[path];
         contentProvider.searchInContent(query, caseSensitive, isRegex, callback);
     },
 
     /**
      * @param {!WebInspector.ProjectSearchConfig} searchConfig
+     * @param {!Array.<string>} filesMathingFileQuery
      * @param {!WebInspector.Progress} progress
      * @param {function(!Array.<string>)} callback
      */
-    findFilesMatchingSearchRequest: function(searchConfig, progress, callback)
+    findFilesMatchingSearchRequest: function(searchConfig, filesMathingFileQuery, progress, callback)
     {
         var result = [];
-        var paths = Object.keys(this._contentProviders);
+        var paths = filesMathingFileQuery;
         var totalCount = paths.length;
         if (totalCount === 0) {
             // searchInContent should call back later.
             setTimeout(doneCallback, 0);
             return;
         }
 
-        paths = paths.filter(searchConfig.filePathMatchesFileQuery.bind(searchConfig));
         var barrier = new CallbackBarrier();
         progress.setTotalWork(paths.length);
         for (var i = 0; i < paths.length; ++i)
             searchInContent.call(this, paths[i], barrier.createCallback(searchInContentCallback.bind(null, paths[i])));
         barrier.callWhenDone(doneCallback);
 
         /**
          * @param {string} path
          * @param {function(boolean)} callback
          * @this {WebInspector.ContentProviderBasedProjectDelegate}
@@ skipping 91 matching lines @@
         return this._contentProviders;
     },
 
     reset: function()
     {
         this._contentProviders = {};
         this._workspace.removeProject(this._id);
         this._projectStore = this._workspace.addProject(this._id, this);
     }
 }