Refactor the Photo Editor to enable new feature work

chrome/browser/resources/file_manager/js/file_manager.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.
 
 /**
  * FileManager constructor.
  *
  * FileManager objects encapsulate the functionality of the file selector
  * dialogs, as well as the full screen file manager application (though the
  * latter is not yet implemented).
@@ skipping 1468 matching lines @@
         if (foundLeaf) {
           // TODO(kaznacheev): use |makeFIlesystemUrl| instead of
           // self.selection.
           var tasks = new FileTasks(self, [self.selection.urls[0]]);
           // There are 3 ways we can get here:
           // 1. Invoked from file_manager_util::ViewFile. This can only
           //    happen for 'gallery' and 'mount-archive' actions.
           // 2. Reloading a Gallery page. Must be an image or a video file.
           // 3. A user manually entered a URL pointing to a file.
           if (FileType.isImageOrVideo(path)) {
-            tasks.execute(self.getExtensionId() + '|gallery');
+            tasks.execute(util.getExtensionId() + '|gallery');
           } else if (FileType.getMediaType(path) == 'archive') {
             self.show_();
-            tasks.execute(self.getExtensionId() + '|mount-archive');
+            tasks.execute(util.getExtensionId() + '|mount-archive');
           } else {
             self.show_();
             return;
           }
         }
       }
       this.directoryModel_.setupPath(path, onLoadedActivateLeaf, onResolve);
       return;
     }
 
@@ skipping 891 matching lines @@
 
     function setVisibility(visibility) {
       panel.setAttribute('visibility', visibility);
     }
   };
 
   FileManager.prototype.isOnGData = function() {
     return this.directoryModel_.getCurrentRootType() === RootType.GDATA;
   };
 
-  FileManager.prototype.getExtensionId = function() {
-    return chrome.extension.getURL('').split('/')[2];
-  };
-
   FileManager.prototype.onExternalLinkClick_ = function(url) {
     chrome.tabs.create({url: url});
     if (this.dialogType_ != FileManager.DialogType.FULL_PAGE) {
       this.onCancel_();
     }
   };
 
   /**
    * Task combobox handler.
    *
@@ skipping 1777 matching lines @@
     }
 
     var defaultActionSeparator =
         this.dialogDom_.querySelector('#default-action-separator');
 
     this.defaultActionMenuItem_.hidden = !taskItem;
     defaultActionSeparator.hidden = !taskItem;
   }
 })();