Revert of Remove installation of Chrome Frame.

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 a1a5692bd1f3b1927c341c403dacdc1bb16d9b71..9486643fdceff8e67dfcd19e49cb41b9ac178c03 100644
--- a/chrome/installer/util/util_constants.cc
+++ b/chrome/installer/util/util_constants.cc
@@ -93,6 +93,10 @@
 // as default browser at system level, if running as non-admin we try to
 // register as default browser only for the current user.
 const char kMakeChromeDefault[] = "make-chrome-default";
+
+// Migrate multi-install Chrome Frame to single-install. Use in conjunction with
+// --uncompressed-archive.
+const char kMigrateChromeFrame[] = "migrate-chrome-frame";
 
 // Tells installer to expect to be run as a subsidiary to an MSI.
 const char kMsi[] = "msi";