IndexedDB: Fix trivial cpplint.py errors

content/child/indexed_db/indexed_db_key_builders.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/child/indexed_db/indexed_db_key_builders.h"
 
+#include <algorithm>
+#include <string>
+#include <vector>
+
 #include "base/logging.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
 
 using blink::WebIDBKey;
 using blink::WebIDBKeyRange;
 using blink::WebIDBKeyTypeArray;
 using blink::WebIDBKeyTypeBinary;
 using blink::WebIDBKeyTypeDate;
 using blink::WebIDBKeyTypeInvalid;
 using blink::WebIDBKeyTypeMin;
@@ skipping 109 matching lines @@
       return blink::WebIDBKeyPath::create(CopyArray(key_path.array()));
     case blink::WebIDBKeyPathTypeNull:
       return blink::WebIDBKeyPath::createNull();
     default:
       NOTREACHED();
       return blink::WebIDBKeyPath::createNull();
   }
 }
 
 }  // namespace content