Give SxS distribution its own registration GUIDs.

chrome/installer/util/browser_distribution.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 a class that contains various method related to branding.
 // It provides only default implementations of these methods. Usually to add
 // specific branding, we will need to extend this class with a custom
 // implementation.
 
 #include "chrome/installer/util/browser_distribution.h"
@@ skipping 239 matching lines @@
 }
 
 string16 BrowserDistribution::GetVersionKey() {
   return L"Software\\Chromium";
 }
 
 bool BrowserDistribution::CanSetAsDefault() {
   return true;
 }
 
+void BrowserDistribution::DebugEnableSetAsDefault() {
+  NOTREACHED();

[grt (UTC plus 2), 2013/08/30 03:28:18]

why NOTREACHED rather than noop? NOTREACHED will cause debug builds of Google
Chrome and Chromium to crash if someone holds down the magic key combo.

[grt (UTC plus 2), 2013/09/04 03:33:36]

ping?

[zturner, 2013/09/05 01:35:29]

Done.

+}
+
+
 bool BrowserDistribution::CanCreateDesktopShortcuts() {
   return true;
 }
 
 bool BrowserDistribution::GetChromeChannel(string16* channel) {
   return false;
 }
 
 bool BrowserDistribution::GetCommandExecuteImplClsid(
     string16* handler_class_uuid) {
@@ skipping 11 matching lines @@
     installer::InstallStatus install_status) {
 }
 
 bool BrowserDistribution::ShouldSetExperimentLabels() {
   return false;
 }
 
 bool BrowserDistribution::HasUserExperiments() {
   return false;
 }