Revert of Remove StringBuilder::appendLiteral.

third_party/WebKit/Source/platform/weborigin/SchemeRegistry.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 336 matching lines @@
 {
     StringBuilder builder;
     bool addSeparator = false;
     URLSchemesSet schemes;
     {
         MutexLocker locker(mutex());
         schemes = CORSEnabledSchemes();
     }
     for (const auto& scheme : schemes) {
         if (addSeparator)
-            builder.append(", ");
+            builder.appendLiteral(", ");
         else
             addSeparator = true;
 
         builder.append(scheme);
     }
     return builder.toString();
 }
 
 bool SchemeRegistry::shouldTreatURLSchemeAsLegacy(const String& scheme)
 {
@@ skipping 94 matching lines @@
 
 bool SchemeRegistry::schemeShouldBypassSecureContextCheck(const String& scheme)
 {
     if (scheme.isEmpty())
         return false;
     MutexLocker locker(mutex());
     return secureContextBypassingSchemes().contains(scheme.lower());
 }
 
 } // namespace blink