Use StringBuilder::appendLiteral() / StringBuilder::append(char) when possible

Source/core/html/forms/EmailInputType.cpp

 /*
  * This file is part of the WebKit project.
  *
  * Copyright (C) 2009 Michelangelo De Simone <micdesim@gmail.com>
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 239 matching lines @@
 String EmailInputType::sanitizeValue(const String& proposedValue) const
 {
     String noLineBreakValue = proposedValue.removeCharacters(isHTMLLineBreak);
     if (!element().multiple())
         return stripLeadingAndTrailingHTMLSpaces(noLineBreakValue);
     Vector<String> addresses;
     noLineBreakValue.split(',', true, addresses);
     StringBuilder strippedValue;
     for (size_t i = 0; i < addresses.size(); ++i) {
         if (i > 0)
-            strippedValue.append(",");
+            strippedValue.append(',');
         strippedValue.append(stripLeadingAndTrailingHTMLSpaces(addresses[i]));
     }
     return strippedValue.toString();
 }
 
 String EmailInputType::convertFromVisibleValue(const String& visibleValue) const
 {
     String sanitizedValue = sanitizeValue(visibleValue);
     if (!element().multiple())
         return convertEmailAddressToASCII(sanitizedValue);
     Vector<String> addresses;
     sanitizedValue.split(',', true, addresses);
     StringBuilder builder;
     builder.reserveCapacity(sanitizedValue.length());
     for (size_t i = 0; i < addresses.size(); ++i) {
         if (i > 0)
-            builder.append(",");
+            builder.append(',');
         builder.append(convertEmailAddressToASCII(addresses[i]));
     }
     return builder.toString();
 }
 
 String EmailInputType::visibleValue() const
 {
     String value = element().value();
     if (!element().multiple())
         return convertEmailAddressToUnicode(value);
 
     Vector<String> addresses;
     value.split(',', true, addresses);
     StringBuilder builder;
     builder.reserveCapacity(value.length());
     for (size_t i = 0; i < addresses.size(); ++i) {
         if (i > 0)
-            builder.append(",");
+            builder.append(',');
         builder.append(convertEmailAddressToUnicode(addresses[i]));
     }
     return builder.toString();
 }
 
 } // namespace blink