Media Galleries: Add a dropPermissionForMediaFileSystem() API.

chrome/renderer/resources/extensions/media_galleries_custom_bindings.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.
 
 // Custom binding for the Media Gallery API.
 
 var binding = require('binding').Binding.create('mediaGalleries');
 var blobNatives = requireNative('blob_natives');
 var mediaGalleriesNatives = requireNative('mediaGalleries');
 
@@ skipping 48 matching lines @@
       var selectedFileSystemIndex = response['selectedFileSystemIndex'];
       if (selectedFileSystemIndex >= 0) {
         selectedFileSystemName = fileSystems[selectedFileSystemIndex].name;
       }
     }
     if (request.callback)
       request.callback(fileSystems, selectedFileSystemName);
     request.callback = null;
   });
 
+  apiFunctions.setUpdateArgumentsPostValidate('forgetMediaFileSystem',
+      function(filesystem, callback) {
+    var metadata = {};
+    if (filesystem && filesystem.name &&
+        mediaGalleriesMetadata[filesystem.name]) {
+      metadata = mediaGalleriesMetadata[filesystem.name];
+    }
+    return [metadata, callback];
+  });
+
   apiFunctions.setHandleRequest('getMediaFileSystemMetadata',
                                 function(filesystem) {
     if (filesystem && filesystem.name &&
         mediaGalleriesMetadata[filesystem.name]) {
       return mediaGalleriesMetadata[filesystem.name];
     }
     return {};
   });
 
   apiFunctions.setUpdateArgumentsPostValidate('getMetadata',
       function(mediaFile, options, callback) {
     var blobUuid = blobNatives.GetBlobUuid(mediaFile)
     return [blobUuid, options, callback];
   });
 });
 
 exports.binding = binding.generate();