Use ContainerNode::hasChildren() instead of firstChild() in conditionals

Source/core/editing/SpellChecker.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 843 matching lines @@
 
 static Node* findFirstMarkable(Node* node)
 {
     while (node) {
         if (!node->renderer())
             return 0;
         if (node->renderer()->isText())
             return node;
         if (node->renderer()->isTextControl())
             node = toRenderTextControl(node->renderer())->textFormControlElement()->visiblePositionForIndex(1).deepEquivalent().deprecatedNode();
-        else if (node->firstChild())
+        else if (node->hasChildren())
             node = node->firstChild();
         else
             node = node->nextSibling();
     }
 
     return 0;
 }
 
 bool SpellChecker::selectionStartHasMarkerFor(DocumentMarker::MarkerType markerType, int from, int length) const
 {
@@ skipping 43 matching lines @@
 }
 
 void SpellChecker::requestTextChecking(const Element& element)
 {
     RefPtrWillBeRawPtr<Range> rangeToCheck = rangeOfContents(const_cast<Element*>(&element));
     m_spellCheckRequester->requestCheckingFor(SpellCheckRequest::create(TextCheckingTypeSpelling | TextCheckingTypeGrammar, TextCheckingProcessBatch, rangeToCheck, rangeToCheck));
 }
 
 
 } // namespace blink