Convert unnecessary ContextLifecycleObservers into ContextClients.

third_party/WebKit/Source/modules/filesystem/DOMFileSystem.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 37 matching lines @@
 
 class DirectoryEntry;
 class BlobCallback;
 class FileEntry;
 class FileWriterCallback;
 
 class MODULES_EXPORT DOMFileSystem final
     : public DOMFileSystemBase,
       public ScriptWrappable,
       public ActiveScriptWrappable<DOMFileSystem>,
-      public ContextLifecycleObserver {
+      public ContextClient {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(DOMFileSystem);
 
  public:
   static DOMFileSystem* create(ExecutionContext*,
                                const String& name,
                                FileSystemType,
                                const KURL& rootURL);
 
   // Creates a new isolated file system for the given filesystemId.
@@ skipping 32 matching lines @@
 
   static String taskNameForInstrumentation() { return "FileSystem"; }
 
   int m_numberOfPendingCallbacks;
   Member<DirectoryEntry> m_rootEntry;
 };
 
 }  // namespace blink
 
 #endif  // DOMFileSystem_h