Give SxS distribution its own registration GUIDs.

chrome/installer/setup/uninstall.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 the methods useful for uninstalling Chrome.
 
 #include "chrome/installer/setup/uninstall.h"
 
 #include <windows.h>
 
@@ skipping 668 matching lines @@
 // Removes XP-era filetype registration making Chrome the default browser.
 // MSDN (see http://msdn.microsoft.com/library/windows/desktop/cc144148.aspx)
 // tells us not to do this, but certain applications break following
 // uninstallation if we don't.
 void RemoveFiletypeRegistration(const InstallerState& installer_state,
                                 HKEY root,
                                 const string16& browser_entry_suffix) {
   string16 classes_path(ShellUtil::kRegClasses);
   classes_path.push_back(base::FilePath::kSeparators[0]);
 
-  const string16 prog_id(ShellUtil::kChromeHTMLProgId + browser_entry_suffix);
+  const string16 prog_id(ShellUtil::GetBrowserProgIdPrefix() +
+      browser_entry_suffix);
 
   // Delete each filetype association if it references this Chrome.  Take care
   // not to delete the association if it references a system-level install of
   // Chrome (only a risk if the suffix is empty).  Don't delete the whole key
   // since other apps may have stored data there.
   std::vector<const wchar_t*> cleared_assocs;
   if (installer_state.system_install() ||
       !browser_entry_suffix.empty() ||
       !base::win::RegKey(HKEY_LOCAL_MACHINE, (classes_path + prog_id).c_str(),
                          KEY_QUERY_VALUE).Valid()) {
@@ skipping 52 matching lines @@
                                   InstallStatus* exit_code) {
   DCHECK(exit_code);
   if (!dist->CanSetAsDefault()) {
     // We should have never set those keys.
     return true;
   }
 
   base::FilePath chrome_exe(installer_state.target_path().Append(kChromeExe));
 
   // Delete Software\Classes\ChromeHTML.
-  const string16 prog_id(ShellUtil::kChromeHTMLProgId + browser_entry_suffix);
+  const string16 prog_id(ShellUtil::GetBrowserProgIdPrefix() +
+      browser_entry_suffix);
   string16 reg_prog_id(ShellUtil::kRegClasses);
   reg_prog_id.push_back(base::FilePath::kSeparators[0]);
   reg_prog_id.append(prog_id);
   InstallUtil::DeleteRegistryKey(root, reg_prog_id);
 
   // Delete Software\Classes\Chrome.
   string16 reg_app_id(ShellUtil::kRegClasses);
   reg_app_id.push_back(base::FilePath::kSeparators[0]);
   // Append the requested suffix manually here (as ShellUtil::GetBrowserModelId
   // would otherwise try to figure out the currently installed suffix).
@@ skipping 654 matching lines @@
     // deletion unconditionally. If they are not empty, the session manager
     // will not delete them on reboot.
     ScheduleParentAndGrandparentForDeletion(target_path);
   } else if (DeleteApplicationProductAndVendorDirectories(target_path) ==
              installer::DELETE_FAILED) {
     *uninstall_status = installer::UNINSTALL_FAILED;
   }
 }
 
 }  // namespace installer