[filemanager] Content metadata moved to the cache.

chrome/browser/resources/file_manager/js/metadata/metadata_provider.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * A base class for metadata provider. Implementing in-memory caching.
  */
 function MetadataCache() {
   this.cache_ = {};
 }
@@ skipping 161 matching lines @@
   }
 
   this[methodName].apply(this, data.arguments);
 };
 
 /**
  * Handles the 'initialized' message from the metadata reader Worker.
  */
 LocalMetadataFetcher.prototype.onInitialized_ = function(regexp) {
   this.urlFilter = regexp;
-
-  // Tests can monitor for this state with
-  // ExtensionTestMessageListener listener("worker-initialized");
-  // ASSERT_TRUE(listener.WaitUntilSatisfied());
-  // Automated tests need to wait for this, otherwise we crash in
-  // browser_test cleanup because the worker process still has
-  // URL requests in-flight.
-  chrome.test.sendMessage('worker-initialized');
   this.initialized_ = true;
 };
 
 LocalMetadataFetcher.prototype.onResult_ = function(url, metadata) {
   this.processResult(url, metadata);
 };
 
 LocalMetadataFetcher.prototype.onError_ = function(url, step, error, metadata) {
   console.warn('metadata: ' + url + ': ' + step + ': ' + error);
   this.processResult(url, metadata || {});
@@ skipping 81 matching lines @@
 MetadataProvider.prototype.fetchLocal = function(url, callback) {
   this.fetch(url, function(metadata) {
     if (metadata.remote) {
       delete metadata.remote;
       this.fetch(url, callback, [this.local_]);
     } else {
       callback(metadata);
     }
   }.bind(this));
 };