Give SxS distribution its own registration GUIDs.

chrome/installer/util/google_chrome_distribution_dummy.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.
 //
 // This file defines dummy implementation of several functions from the
 // BrowserDistribution class for Google Chrome. These functions allow 64-bit
 // Windows Chrome binary to build successfully. Since this binary is only used
 // for Native Client support, most of the install/uninstall functionality is not
 // necessary there.
 
@@ skipping 38 matching lines @@
 int GoogleChromeDistribution::GetIconIndex(ShortcutType shortcut_type) {
   NOTREACHED();
   return 0;
 }
 
 string16 GoogleChromeDistribution::GetBaseAppId() {
   NOTREACHED();
   return string16();
 }
 
+string16 GoogleChromeDistribution::GetBrowserProgIdPrefix() {
+  NOTREACHED();
+  return string16();
+}
+
+string16 GoogleChromeDistribution::GetBrowserProgIdDesc() {
+  NOTREACHED();
+  return string16();
+}
+
 string16 GoogleChromeDistribution::GetInstallSubDir() {
   NOTREACHED();
   return string16();
 }
 
 string16 GoogleChromeDistribution::GetPublisherName() {
   NOTREACHED();
   return string16();
 }
 
@@ skipping 71 matching lines @@
 
 bool GoogleChromeDistribution::ShouldSetExperimentLabels() {
   NOTREACHED();
   return false;
 }
 
 bool GoogleChromeDistribution::HasUserExperiments() {
   NOTREACHED();
   return false;
 }