Give SxS distribution its own registration GUIDs.

chrome/installer/util/browser_distribution.cc

Index: chrome/installer/util/browser_distribution.cc
diff --git a/chrome/installer/util/browser_distribution.cc b/chrome/installer/util/browser_distribution.cc
index 8a249272c802c84b96462548f3bf4ed1c7956b8a..fe66c47b0f73b3a3e1b7d2974b6ddd440e6752bf 100644
--- a/chrome/installer/util/browser_distribution.cc
+++ b/chrome/installer/util/browser_distribution.cc
@@ -257,6 +257,11 @@ 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;
 }