Move ExtensionWindowController and related into extensions namespace

chrome/browser/extensions/window_controller_list.h

Index: chrome/browser/extensions/window_controller_list.h
diff --git a/chrome/browser/extensions/window_controller_list.h b/chrome/browser/extensions/window_controller_list.h
new file mode 100644
index 0000000000000000000000000000000000000000..3c6915b036739b54346f90d1358ebf9cae407fe8
--- /dev/null
+++ b/chrome/browser/extensions/window_controller_list.h
@@ -0,0 +1,55 @@
+// 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_WINDOW_CONTROLLER_LIST_H_
+#define CHROME_BROWSER_EXTENSIONS_WINDOW_CONTROLLER_LIST_H_
+
+#include <list>
+
+#include "base/compiler_specific.h"
+#include "base/memory/singleton.h"
+#include "chrome/browser/extensions/window_controller.h"
+
+class Profile;
+class UIThreadExtensionFunction;
+
+namespace extensions {
+
+// Class to maintain a list of WindowControllers.
+class WindowControllerList {
+ public:
+  typedef std::list<WindowController*> ControllerList;
+
+  WindowControllerList();
+  ~WindowControllerList();
+
+  void AddExtensionWindow(WindowController* window);
+  void RemoveExtensionWindow(WindowController* window);
+
+  // Returns a window matching the context the function was invoked in.
+  WindowController* FindWindowForFunctionById(
+      const UIThreadExtensionFunction* function,
+      int id) const;
+
+  // Returns the focused or last added window matching the context the function
+  // was invoked in.
+  WindowController* CurrentWindowForFunction(
+      const UIThreadExtensionFunction* function) const;
+
+  const ControllerList& windows() const { return windows_; }
+
+  static WindowControllerList* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<WindowControllerList>;
+
+  // Entries are not owned by this class and must be removed when destroyed.
+  ControllerList windows_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowControllerList);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_WINDOW_CONTROLLER_LIST_H_