Give SxS distribution its own registration GUIDs.

chrome/installer/util/google_chrome_sxs_distribution.h

Index: chrome/installer/util/google_chrome_sxs_distribution.h
diff --git a/chrome/installer/util/google_chrome_sxs_distribution.h b/chrome/installer/util/google_chrome_sxs_distribution.h
index 5261a7accdd044708b9b8d8220c51b1f7cf92b55..60ee9b9db1b53f968d32803b13e94b84ca505cc3 100644
--- a/chrome/installer/util/google_chrome_sxs_distribution.h
+++ b/chrome/installer/util/google_chrome_sxs_distribution.h
@@ -26,6 +26,7 @@ class GoogleChromeSxSDistribution : public GoogleChromeDistribution {
   virtual string16 GetInstallSubDir() OVERRIDE;
   virtual string16 GetUninstallRegPath() OVERRIDE;
   virtual bool CanSetAsDefault() OVERRIDE;
+  virtual void DebugEnableSetAsDefault() OVERRIDE;
   virtual bool GetChromeChannel(string16* channel) OVERRIDE;
   virtual bool GetCommandExecuteImplClsid(
       string16* handler_class_uuid) OVERRIDE;
@@ -39,6 +40,8 @@ class GoogleChromeSxSDistribution : public GoogleChromeDistribution {
 
   // Disallow construction from non-friends.
   GoogleChromeSxSDistribution();
+
+  bool enable_set_as_default_;
 };
 
 #endif  // CHROME_INSTALLER_UTIL_GOOGLE_CHROME_SXS_DISTRIBUTION_H_