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

Source/core/inspector/InspectorOverlay.cpp

 /*
  * Copyright (C) 2011 Google 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
@@ skipping 618 matching lines @@
         for (size_t i = 0; i < classNameCount; ++i) {
             const AtomicString& className = classNamesString[i];
             if (!usedClassNames.add(className).isNewEntry)
                 continue;
             classNames.append('.');
             classNames.append(className);
         }
     }
     if (pseudoElement) {
         if (pseudoElement->pseudoId() == BEFORE)
-            classNames.append("::before");
+            classNames.appendLiteral("::before");
         else if (pseudoElement->pseudoId() == AFTER)
-            classNames.append("::after");
+            classNames.appendLiteral("::after");
     }
     if (!classNames.isEmpty())
         elementInfo->setString("className", classNames.toString());
 
     RenderObject* renderer = element->renderer();
     FrameView* containingView = element->document().view();
     if (!renderer || !containingView)
         return elementInfo;
 
     IntRect boundingBox = pixelSnappedIntRect(containingView->contentsToRootView(renderer->absoluteBoundingBoxRect()));
@@ skipping 194 matching lines @@
     hideHighlight();
 }
 
 void InspectorOverlay::startedRecordingProfile()
 {
     if (!m_activeProfilerCount++)
         freePage();
 }
 
 } // namespace blink