Disable an extension when it is upgraded to a version that requires more

chrome/browser/extensions/extension_browsertest.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_EXTENSION_BROWSER_TEST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_BROWSER_TEST_H_
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "chrome/common/notification_details.h"
 #include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
 #include "chrome/common/notification_type.h"
 #include "chrome/test/in_process_browser_test.h"
 
 // Base class for extension browser tests. Provides utilities for loading,
 // unloading, and installing extensions.
 class ExtensionBrowserTest
     : public InProcessBrowserTest, public NotificationObserver {
  protected:
   virtual void SetUpCommandLine(CommandLine* command_line);
   bool LoadExtension(const FilePath& path);
-  bool InstallExtension(const FilePath& path);
+  // |expected_change| indicates how many extensions should be installed (or
+  // disabled, if negative).
+  // 1 means you expect a new install, 0 means you expect an upgrade, -1 means
+  // you expect a failed upgrade.
+  bool InstallExtension(const FilePath& path, int expected_change);
   void UninstallExtension(const std::string& extension_id);
 
   // Wait for the number of visible page actions to change to |count|.
   bool WaitForPageActionVisibilityChangeTo(int count);
 
   bool loaded_;
   bool installed_;
   FilePath test_data_dir_;
 
  private:
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
   bool WaitForExtensionHostsToLoad();
-
-  NotificationRegistrar registrar_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_BROWSER_TEST_H_