Use InstallDetails in setup.

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>
 #include <stddef.h>
@@ skipping 977 matching lines @@
   const ProductState* product_state =
       original_state.GetProductState(installer_state.system_install());
 
   // Remove the event log provider registration as we are going to delete
   // the file which serves the resources anyways.
   DeRegisterEventLogProvider();
 
   // Delete shared registry keys as well (these require admin rights) if
   // remove_all option is specified.
   if (remove_all) {
-    if (!InstallUtil::IsChromeSxSProcess()) {
-      // Delete media player registry key that exists only in HKLM. We don't
-      // delete this key in SxS uninstall as we never set the key for it.
+    if (installer_state.system_install()) {
+      // Delete media player registry key that exists only in HKLM.
       base::string16 reg_path(installer::kMediaPlayerRegPath);
       reg_path.push_back(base::FilePath::kSeparators[0]);
       reg_path.append(installer::kChromeExe);
       InstallUtil::DeleteRegistryKey(HKEY_LOCAL_MACHINE, reg_path,
                                      WorkItem::kWow64Default);
     }
   }
 
   // Finally delete all the files from Chrome folder after moving setup.exe
   // and the user's Local State to a temp location.
@@ skipping 94 matching lines @@
     // If we need a reboot to continue, schedule the parent directories for
     // deletion unconditionally. If they are not empty, the session manager
     // will not delete them on reboot.
     ScheduleParentAndGrandparentForDeletion(target_path);
   } else if (DeleteChromeDirectoriesIfEmpty(target_path) == DELETE_FAILED) {
     *uninstall_status = UNINSTALL_FAILED;
   }
 }
 
 }  // namespace installer