Add a self-destruct mechanism to user-level Chrome Frame when it detects that system-level Chrome...

chrome_frame/chrome_frame_helper_util.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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_FRAME_CHROME_FRAME_HELPER_UTIL_H_
 #define CHROME_FRAME_CHROME_FRAME_HELPER_UTIL_H_
 
 #include <windows.h>
 
 // Compare the given class name with the known window class names for
 // internet explorer browser windows.
@@ skipping 49 matching lines @@
 // @param process_id_to_match [in] This parameter will be used to match
 //                                 particular process id for window.
 // @return The window handle of the matching window, if found, or NULL.
 //
 HWND RecurseFindWindow(HWND parent,
                        const wchar_t* class_name,
                        const wchar_t* window_name,
                        DWORD thread_id_to_match,
                        DWORD process_id_to_match);
 
+// Reads |value_size| characters from a value named |value_name| in |key| and
+// places them in the buffer pointed to by |value|. Returns ERROR_SUCCESS on
+// success.
+LONG ReadValue(HKEY key,
+               const wchar_t* value_name,
+               size_t value_size,
+               wchar_t* value);
+
+
+// Returns true if our BHO is registered in the HKLM subkey that IE checks for
+// the list of BHOs to load.
+bool IsBHOLoadingPolicyRegistered();
+
+// Returns true if system-level Chrome Frame is installed.
+bool IsSystemLevelChromeFrameInstalled();
+
 #endif  // CHROME_FRAME_CHROME_FRAME_HELPER_UTIL_H_