Use the single char overload of append() when possible.

third_party/WebKit/Source/core/fetch/Resource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple 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
@@ skipping 600 matching lines @@
         builder.append("hasClients(");
         builder.appendNumber(m_clients.size());
         if (!m_clientsAwaitingCallback.isEmpty()) {
             builder.append(", AwaitingCallback=");
             builder.appendNumber(m_clientsAwaitingCallback.size());
         }
         if (!m_finishedClients.isEmpty()) {
             builder.append(", Finished=");
             builder.appendNumber(m_finishedClients.size());
         }
-        builder.append(")");
+        builder.append(')');
     }
     if (m_loader) {
         if (!builder.isEmpty())
             builder.append(' ');
         builder.append("m_loader");
     }
     if (m_preloadCount) {
         if (!builder.isEmpty())
             builder.append(' ');
         builder.append("m_preloadCount(");
         builder.appendNumber(m_preloadCount);
-        builder.append(")");
+        builder.append(')');
     }
     if (memoryCache()->contains(this)) {
         if (!builder.isEmpty())
             builder.append(' ');
         builder.append("in_memory_cache");
     }
     return builder.toString();
 }
 
 void Resource::didAddClient(ResourceClient* c)
@@ skipping 484 matching lines @@
     case Resource::Media:
         return "Media";
     case Resource::Manifest:
         return "Manifest";
     }
     ASSERT_NOT_REACHED();
     return "Unknown";
 }
 
 } // namespace blink