Remove 'String::append' from some of the blink source.

Source/core/inspector/InspectorDOMAgent.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * 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
@@ skipping 1439 matching lines @@
     int id = bind(node, nodesMap);
     String nodeName;
     String localName;
     String nodeValue;
 
     switch (node->nodeType()) {
     case Node::TEXT_NODE:
     case Node::COMMENT_NODE:
     case Node::CDATA_SECTION_NODE:
         nodeValue = node->nodeValue();
-        if (nodeValue.length() > maxTextSize) {
-            nodeValue = nodeValue.left(maxTextSize);
-            nodeValue.append(ellipsisUChar);
-        }
+        if (nodeValue.length() > maxTextSize)
+            nodeValue = nodeValue.left(maxTextSize) + ellipsisUChar;
         break;
     case Node::ATTRIBUTE_NODE:
         localName = node->localName();
         break;
     case Node::DOCUMENT_FRAGMENT_NODE:
     case Node::DOCUMENT_NODE:
     case Node::ELEMENT_NODE:
     default:
         nodeName = node->nodeName();
         localName = node->localName();
@@ skipping 556 matching lines @@
     if (!m_documentNodeToIdMap.contains(m_document)) {
         RefPtr<TypeBuilder::DOM::Node> root;
         getDocument(errorString, root);
         return errorString->isEmpty();
     }
     return true;
 }
 
 } // namespace WebCore