Fix BASE_EXPORT on QueryNode

TBR=eroman

Review URL: http://codereview.chromium.org/8400079

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@107830 0039d316-1c4b-4281-b951-d872f2087c98

base/test/trace_event_analyzer.h

@@ -361,7 +361,7 @@ class BASE_EXPORT Query {
 
 // Implementation detail:
 // QueryNode allows Query to store a ref-counted query tree.
-class QueryNode : public base::RefCounted<QueryNode> {
+class BASE_EXPORT QueryNode : public base::RefCounted<QueryNode> {
  public:
   explicit QueryNode(const Query& query);
   const Query& query() const { return query_; }