Use InstallDetails in setup.

chrome/installer/setup/uninstall.cc

Index: chrome/installer/setup/uninstall.cc
diff --git a/chrome/installer/setup/uninstall.cc b/chrome/installer/setup/uninstall.cc
index b1c5c5b30caf7aa0a3406be6c7987778f4524bb5..7d403a3b91fbc7218ba2417ff82aed2f99ba86e7 100644
--- a/chrome/installer/setup/uninstall.cc
+++ b/chrome/installer/setup/uninstall.cc
@@ -1221,10 +1221,8 @@ InstallStatus UninstallProduct(const InstallationState& original_state,
   // Delete shared registry keys as well (these require admin rights) if
   // remove_all option is specified.
   if (remove_all) {
-    if (!InstallUtil::IsChromeSxSProcess() && is_chrome) {
+    if (is_chrome && installer_state.system_install()) {
       // Delete media player registry key that exists only in HKLM.
-      // We don't delete this key in SxS uninstall or Chrome Frame uninstall
-      // as we never set the key for those products.
       base::string16 reg_path(installer::kMediaPlayerRegPath);
       reg_path.push_back(base::FilePath::kSeparators[0]);
       reg_path.append(installer::kChromeExe);