Give SxS distribution its own registration GUIDs.

chrome/installer/util/chrome_app_host_distribution.h

 // 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 extends the browser distribution with a specific implementation
 // for Chrome AppHost.
 
 #ifndef CHROME_INSTALLER_UTIL_CHROME_APP_HOST_DISTRIBUTION_H_
 #define CHROME_INSTALLER_UTIL_CHROME_APP_HOST_DISTRIBUTION_H_
 
 #include "chrome/installer/util/browser_distribution.h"
 #include "chrome/installer/util/util_constants.h"
 
 class ChromeAppHostDistribution : public BrowserDistribution {
  public:
   virtual string16 GetAppGuid() OVERRIDE;
 
   virtual string16 GetDisplayName() OVERRIDE;
 
+  virtual string16 GetBrowserProgIdPrefix() OVERRIDE;
+

[grt (UTC plus 2), 2013/09/11 03:52:32]

shouldn't GetBrowserProgIdDesc should NOTREACHED, too?

[zturner, 2013/09/11 21:16:59]

Done.

   // This can only be called with SHORTCUT_APP_LAUNCHER for |shortcut_type|.
   virtual string16 GetShortcutName(ShortcutType shortcut_type) OVERRIDE;
 
   virtual string16 GetIconFilename() OVERRIDE;
 
   virtual string16 GetBaseAppName() OVERRIDE;
 
   virtual string16 GetBaseAppId() OVERRIDE;
 
   virtual string16 GetInstallSubDir() OVERRIDE;
@@ skipping 32 matching lines @@
       installer::InstallStatus install_status) OVERRIDE;
 
  protected:
   friend class BrowserDistribution;
 
   // Disallow construction from non-friends.
   ChromeAppHostDistribution();
 };
 
 #endif  // CHROME_INSTALLER_UTIL_CHROME_APP_HOST_DISTRIBUTION_H_