Keep only base/extractor.[cc|h].

ui/ui_displayed_event.h

-// Copyright 2008-2009 Google Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-// ========================================================================
-// This is for Omaha2 backwards compatibility.
-// The installed Omaha3 handoff process sets an event to tell an Omaha2 setup
-// worker running from the temp directory that a UI has been displayed so that
-// the Omaha2 worker will not display a second UI on error. The event's name is
-// passed in an environment variable name by the Omaha2 worker.
-
-#ifndef OMAHA_UI_UI_DISPLAYED_EVENT_H_
-#define OMAHA_UI_UI_DISPLAYED_EVENT_H_
-
-#include <windows.h>
-#include "omaha/base/scoped_any.h"
-
-namespace omaha {
-
-// Manages the UI Displayed Event, which is used to communicate whether a UI
-// has been displayed between processes.
-// This class is not thread safe.
-class UIDisplayedEventManager {
- public:
-  // Signals the event. Creates it if its name does not already exist in the
-  // environment variable.
-  static void SignalEvent(bool is_machine);
-
- private:
-   // Creates the event and sets its name in the environment variable.
-   static HRESULT CreateEvent(bool is_machine);
-
-   // Gets the event from the name in the environment variable.
-   static HRESULT GetEvent(bool is_machine, HANDLE* ui_displayed_event);
-
-  // Returns whether this process's event handle has been initialized.
-  static bool IsEventHandleInitialized();
-
-  // A single instance of the UI Displayed Event handle to be used for the
-  // lifetime of this process.
-  static scoped_handle ui_displayed_event_;
-};
-
-}  // namespace omaha
-
-#endif  // OMAHA_UI_UI_DISPLAYED_EVENT_H_