Move ExtensionWindowController and related into extensions namespace

chrome/browser/extensions/extension_window_list.h

-// 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.
-
-#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_WINDOW_LIST_H_
-#define CHROME_BROWSER_EXTENSIONS_EXTENSION_WINDOW_LIST_H_
-
-#include <list>
-
-#include "base/compiler_specific.h"
-#include "base/memory/singleton.h"
-#include "chrome/browser/extensions/extension_window_controller.h"
-
-class Profile;
-class UIThreadExtensionFunction;
-
-// Class to maintain a list of ExtensionWindowControllers.
-class ExtensionWindowList {
- public:
-  typedef std::list<ExtensionWindowController*> WindowList;
-
-  ExtensionWindowList();
-  ~ExtensionWindowList();
-
-  void AddExtensionWindow(ExtensionWindowController* window);
-  void RemoveExtensionWindow(ExtensionWindowController* window);
-
-  // Returns a window matching the context the function was invoked in.
-  ExtensionWindowController* FindWindowForFunctionById(
-      const UIThreadExtensionFunction* function,
-      int id) const;
-
-  // Returns the focused or last added window matching the context the function
-  // was invoked in.
-  ExtensionWindowController* CurrentWindowForFunction(
-      const UIThreadExtensionFunction* function) const;
-
-  const WindowList& windows() const { return windows_; }
-
-  static ExtensionWindowList* GetInstance();
-
- private:
-  friend struct DefaultSingletonTraits<ExtensionWindowList>;
-
-  // Entries are not owned by this class and must be removed when destroyed.
-  WindowList windows_;
-
-  DISALLOW_COPY_AND_ASSIGN(ExtensionWindowList);
-};
-
-#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_WINDOW_LIST_H_