Remove the alternative preferences filename from JsonPrefStore.

chrome/common/chrome_constants.cc

Index: chrome/common/chrome_constants.cc
diff --git a/chrome/common/chrome_constants.cc b/chrome/common/chrome_constants.cc
index d480ff03f60e0380eea243910ea8c2aa13db949c..3734f21e3822944980f60e1d321fce183c9b7e45 100644
--- a/chrome/common/chrome_constants.cc
+++ b/chrome/common/chrome_constants.cc
@@ -160,8 +160,6 @@ const base::FilePath::CharType kOfflinePageRequestQueueDirname[] =
 const base::FilePath::CharType kPreferencesFilename[] = FPL("Preferences");
 const base::FilePath::CharType kPreviewsOptOutDBFilename[] =
     FPL("previews_opt_out.db");
-const base::FilePath::CharType kProtectedPreferencesFilenameDeprecated[] =
-    FPL("Protected Preferences");
 const base::FilePath::CharType kReadmeFilename[] = FPL("README");
 const base::FilePath::CharType kSecurePreferencesFilename[] =
     FPL("Secure Preferences");