Clarify the use of --register-chrome-browser-suffix which triggers |unique_suffix| in ShellUtil::Re…

chrome/installer/util/util_constants.cc

Index: chrome/installer/util/util_constants.cc
diff --git a/chrome/installer/util/util_constants.cc b/chrome/installer/util/util_constants.cc
index cbbec7ab73b71bca12fa6f2fa5451652a813d0ce..d2af2a4ba8740f87f1686075c6b5166c2ee4d7b0 100644
--- a/chrome/installer/util/util_constants.cc
+++ b/chrome/installer/util/util_constants.cc
@@ -107,8 +107,10 @@ const char kNewSetupExe[] = "new-setup-exe";
 // options kInstallArchive and kUninstall are ignored.
 const char kRegisterChromeBrowser[] = "register-chrome-browser";
 
-const char kRegisterChromeBrowserSuffix[] =
-    "register-chrome-browser-suffix";
+// Used by the installer to forward the registration suffix of the
+// (un)installation in progress when launching an elevated setup.exe to finish
+// registration work.
+const char kRegisterChromeBrowserSuffix[] = "register-chrome-browser-suffix";
 
 // Switch to allow an extra URL protocol to be registered. This option is used
 // in conjunction with kRegisterChromeBrowser to specify an extra protocol