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

Source/core/html/forms/FormController.cpp

 /*
  * Copyright (C) 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010, 2011, 2012 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 299 matching lines @@
     typedef HashMap<String, unsigned> FormSignatureToNextIndexMap;
     FormToKeyMap m_formToKeyMap;
     FormSignatureToNextIndexMap m_formSignatureToNextIndexMap;
 };
 
 static inline void recordFormStructure(const HTMLFormElement& form, StringBuilder& builder)
 {
     // 2 is enough to distinguish forms in webkit.org/b/91209#c0
     const size_t namedControlsToBeRecorded = 2;
     const FormAssociatedElement::List& controls = form.associatedElements();
-    builder.append(" [");
+    builder.appendLiteral(" [");
     for (size_t i = 0, namedControls = 0; i < controls.size() && namedControls < namedControlsToBeRecorded; ++i) {
         if (!controls[i]->isFormControlElementWithState())
             continue;
         HTMLFormControlElementWithState* control = toHTMLFormControlElementWithState(controls[i]);
         if (!ownerFormForState(*control))
             continue;
         AtomicString name = control->name();
         if (name.isEmpty())
             continue;
         namedControls++;
         builder.append(name);
-        builder.append(" ");
+        builder.append(' ');
     }
-    builder.append("]");
+    builder.append(']');
 }
 
 static inline String formSignature(const HTMLFormElement& form)
 {
     KURL actionURL = form.getURLAttribute(actionAttr);
     // Remove the query part because it might contain volatile parameters such
     // as a session key.
     if (!actionURL.isEmpty())
         actionURL.setQuery(String());
 
@@ skipping 215 matching lines @@
 {
     m_documentState->addControl(&control);
 }
 
 void FormController::unregisterStatefulFormControl(HTMLFormControlElementWithState& control)
 {
     m_documentState->removeControl(&control);
 }
 
 } // namespace blink