Uninstall multi-install Chrome Frame when updated.

chrome/installer/util/util_constants.cc

Index: chrome/installer/util/util_constants.cc
diff --git a/chrome/installer/util/util_constants.cc b/chrome/installer/util/util_constants.cc
index 3d6baba52b7be746c4eeaabe7dee6ae91db5baee..36b47347cd0b99e9c0cae1a23726716a8fd45d29 100644
--- a/chrome/installer/util/util_constants.cc
+++ b/chrome/installer/util/util_constants.cc
@@ -233,6 +233,7 @@ const wchar_t kChromeDll[] = L"chrome.dll";
 const wchar_t kChromeChildDll[] = L"chrome_child.dll";
 const wchar_t kChromeExe[] = L"chrome.exe";
 const wchar_t kChromeFrameDll[] = L"npchrome_frame.dll";
+const wchar_t kChromeFrameHelperDll[] = L"chrome_frame_helper.dll";
 const wchar_t kChromeFrameHelperExe[] = L"chrome_frame_helper.exe";
 const wchar_t kChromeFrameHelperWndClass[] = L"ChromeFrameHelperWindowClass";
 const wchar_t kChromeFrameReadyModeField[] = L"ChromeFrameReadyMode";