Add a ExtensionBrowserTest base class

chrome/browser/extensions/test_extension_loader.h

-// Copyright (c) 2009 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_TEST_EXTENSION_LOADER_H_
-#define CHROME_BROWSER_EXTENSIONS_TEST_EXTENSION_LOADER_H_
-
-#include "chrome/common/notification_observer.h"
-#include "chrome/common/notification_registrar.h"
-
-class Extension;
-class FilePath;
-class Profile;
-
-class TestExtensionLoader : public NotificationObserver {
- public:
-  explicit TestExtensionLoader(Profile* profile);
-
-  // Tells the extension service to load the extension at the given path.  It
-  // waits for the extension with the expected ID to load, then returns a
-  // handle to it.
-  Extension* Load(const char* extension_id, const FilePath& path);
-
-  // Same as above, but installs from a CRX first.
-  Extension* Install(const char* extension_id, const FilePath& path);
-
-  virtual void Observe(NotificationType type,
-                       const NotificationSource& source,
-                       const NotificationDetails& details);
-
- private:
-  Profile* profile_;
-  Extension* extension_;
-  NotificationRegistrar registrar_;
-  std::string loading_extension_id_;
-
-  DISALLOW_COPY_AND_ASSIGN(TestExtensionLoader);
-};
-
-#endif  // CHROME_BROWSER_EXTENSIONS_TEST_EXTENSION_LOADER_H_