[Blink-FileAPI] Add the notification of update observer.

chrome/browser/sync_file_system/local/local_file_change_tracker_unittest.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/sync_file_system/local/local_file_change_tracker.h"
 
 #include <deque>
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 547 matching lines @@
   // Make sure we have no in-memory changes in the tracker.
   file_system_.GetChangedURLsInTracker(&urls);
   ASSERT_EQ(0U, urls.size());
 
   RestoreChangesFromTrackerDB();
 
   // Make sure the changes are restored from the DB.
   file_system_.GetChangedURLsInTracker(&urls);
   // Deletion for child files in the deleted directory cannot be restored,
   // so we will only have 8 changes.
-  EXPECT_EQ(8U, urls.size());
+  EXPECT_EQ(10U, urls.size());
 
   VerifyAndClearChange(URL(kPath0),
                        FileChange(FileChange::FILE_CHANGE_DELETE,
                                   sync_file_system::SYNC_FILE_TYPE_UNKNOWN));
   VerifyAndClearChange(URL(kPath1),
                        FileChange(FileChange::FILE_CHANGE_DELETE,
                                   sync_file_system::SYNC_FILE_TYPE_UNKNOWN));
   VerifyAndClearChange(URL(kPath3),
                        FileChange(FileChange::FILE_CHANGE_DELETE,
                                   sync_file_system::SYNC_FILE_TYPE_UNKNOWN));
@@ skipping 126 matching lines @@
 
   // Make sure they're gone from the database too.
   DropChangesInTracker();
   RestoreChangesFromTrackerDB();
 
   GetAllChangedURLs(&urls);
   EXPECT_TRUE(urls.empty());
 }
 
 }  // namespace sync_file_system