remove use of {,un}setPendingActivity from DOMFileSystem.

Source/modules/filesystem/InspectorFileSystemAgent.cpp

 /*
  * Copyright (C) 2011, 2012 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 547 matching lines @@
 
     FileSystemType type;
     String path;
     if (!DOMFileSystemBase::crackFileSystemURL(m_url, type, path)) {
         errorCallback->handleEvent(FileError::create(FileError::SYNTAX_ERR).get());
         return;
     }
 
     if (path == "/") {
         OwnPtr<VoidCallback> successCallback = adoptPtr(new VoidCallbackImpl(this));
-        OwnPtr<AsyncFileSystemCallbacks> fileSystemCallbacks = VoidCallbacks::create(successCallback.release(), errorCallback.release(), 0);
+        OwnPtr<AsyncFileSystemCallbacks> fileSystemCallbacks = VoidCallbacks::create(successCallback.release(), errorCallback.release(), nullptr);
         LocalFileSystem::from(*executionContext)->deleteFileSystem(executionContext, type, fileSystemCallbacks.release());
     } else {
         OwnPtr<EntryCallback> successCallback = CallbackDispatcherFactory<EntryCallback>::create(this, &DeleteEntryRequest::didGetEntry);
         OwnPtr<AsyncFileSystemCallbacks> fileSystemCallbacks = ResolveURICallbacks::create(successCallback.release(), errorCallback.release(), executionContext);
         LocalFileSystem::from(*executionContext)->resolveURL(executionContext, m_url, fileSystemCallbacks.release());
     }
 }
 
 bool DeleteEntryRequest::didGetEntry(Entry* entry)
 {
@@ skipping 139 matching lines @@
     for (LocalFrame* frame = m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
         if (frame->document() && frame->document()->securityOrigin()->isSameSchemeHostPort(origin))
             return frame->document();
     }
 
     *error = "No frame is available for the request";
     return 0;
 }
 
 } // namespace WebCore