Allow external protocol handlers to open in Windows 8.

chrome/browser/shell_integration_win.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/shell_integration.h"
 
 #include <windows.h>
 #include <shobjidl.h>
 #include <propkey.h>
 #include <propvarutil.h>
@@ skipping 355 matching lines @@
   // Determine the app path. If we can't determine what that is, we have
   // bigger fish to fry...
   FilePath app_path;
   if (!PathService::Get(base::FILE_EXE, &app_path)) {
     LOG(ERROR) << "Error getting app exe path";
     return UNKNOWN_DEFAULT_WEB_CLIENT;
   }
 
   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);
     if (!SUCCEEDED(hr))
       return NOT_DEFAULT_WEB_CLIENT;
 
     BrowserDistribution* dist = BrowserDistribution::GetDistribution();
     string16 app_name = dist->GetApplicationName();
     // If a user specific default browser entry exists, we check for that
     // app name being default. If not, then default browser is just called
@@ skipping 112 matching lines @@
 }
 
 void ShellIntegration::MigrateChromiumShortcuts() {
   if (base::win::GetVersion() < base::win::VERSION_WIN7)
     return;
 
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       base::Bind(&MigrateChromiumShortcutsCallback));
 }