Mark the AtomicString(const String&) constructor as explicit

Source/core/xml/XPathFunctions.cpp

 /*
  * Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006, 2009 Apple Inc.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  *
  * 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 331 matching lines @@
 
         if (startPos == length)
             break;
 
         size_t endPos = startPos;
         while (endPos < length && !isWhitespace(idList[endPos]))
             ++endPos;
 
         // If there are several nodes with the same id, id() should return the first one.
         // In WebKit, getElementById behaves so, too, although its behavior in this case is formally undefined.
-        Node* node = contextScope.getElementById(idList.substring(startPos, endPos - startPos));
+        Node* node = contextScope.getElementById(AtomicString(idList.substring(startPos, endPos - startPos)));
         if (node && resultSet.add(node).isNewEntry)
             result.append(node);
 
         startPos = endPos;
     }
 
     result.markSorted(false);
 
     return Value(result, Value::adopt);
 }
@@ skipping 368 matching lines @@
         return 0;
 
     Function* function = functionRec->factoryFn();
     function->setArguments(args);
     function->setName(name);
     return function;
 }
 
 }
 }