Allow external protocol handlers to open in Windows 8.

chrome/browser/shell_integration_win.cc

Index: chrome/browser/shell_integration_win.cc
diff --git a/chrome/browser/shell_integration_win.cc b/chrome/browser/shell_integration_win.cc
index 0aa9d94eccd11ee22e59fddf19969d20d268fa8a..f4b75e6edabdcc154aaf245823845e70ffdbc256 100644
--- a/chrome/browser/shell_integration_win.cc
+++ b/chrome/browser/shell_integration_win.cc
@@ -373,7 +373,10 @@ ShellIntegration::DefaultWebClientState
 
   string16 wprotocol = UTF8ToUTF16(protocol);
 
-  if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
+  if (base::win::GetVersion() >= base::win::VERSION_WIN8) {
+    // Windows 8 has removed the ability to ask about the default handlers.
+    return UNKNOWN_DEFAULT_WEB_CLIENT;
+  } else if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
     base::win::ScopedComPtr<IApplicationAssociationRegistration> pAAR;
     HRESULT hr = pAAR.CreateInstance(CLSID_ApplicationAssociationRegistration,
         NULL, CLSCTX_INPROC);