Cleaning up and updating mock_chrome.js

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

Index: chrome/browser/resources/file_manager/js/metadata_provider.js
diff --git a/chrome/browser/resources/file_manager/js/metadata_provider.js b/chrome/browser/resources/file_manager/js/metadata_provider.js
index ecddd767a7a60aec2c05cd13d95836806f8c3fd2..d225b34435f8238d5ff7f54c8cb32baa612ab4fd 100644
--- a/chrome/browser/resources/file_manager/js/metadata_provider.js
+++ b/chrome/browser/resources/file_manager/js/metadata_provider.js
@@ -11,8 +11,13 @@ function MetadataProvider(opt_workerPath) {
   // Pass all URLs to the metadata reader until we have a correct filter.
   this.urlFilter = /.*/;
 
-  this.dispatcher_ = new Worker(opt_workerPath ||
-      document.location.origin + '/js/metadata_dispatcher.js');
+  if (!opt_workerPath) {
+    var path = document.location.pathname;
+    opt_workerPath = path.substring(0, path.lastIndexOf('/') + 1) +
+        'js/metadata_dispatcher.js';
+  }
+
+  this.dispatcher_ = new Worker(opt_workerPath);
   this.dispatcher_.onmessage = this.onMessage_.bind(this);
   this.dispatcher_.postMessage({verb: 'init'});
   // Initialization is not complete until the Worker sends back the