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diff --git a/Source/WebCore/contentextensions/DFA.h b/Source/WebCore/contentextensions/DFA.h
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+++ b/Source/WebCore/contentextensions/DFA.h
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+/*
+ * Copyright (C) 2014, 2015 Apple Inc. All rights reserved.
+ *
+ * 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
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#if ENABLE(CONTENT_EXTENSIONS)
+
+#include "ContentExtensionsDebugging.h"
+#include "DFANode.h"
+#include "PlatformExportMacros.h"
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+namespace ContentExtensions {
+
+// The DFA abstract a partial DFA graph in a compact form.
+struct WEBCORE_EXPORT DFA {
+    static DFA empty();
+
+    void shrinkToFit();
+    void minimize();
+    unsigned graphSize() const;
+    size_t memoryUsed() const;
+
+#if CONTENT_EXTENSIONS_STATE_MACHINE_DEBUGGING
+    void debugPrintDot() const;
+#endif
+
+    Vector<DFANode, 0, ContentExtensionsOverflowHandler> nodes;
+    Vector<uint64_t, 0, ContentExtensionsOverflowHandler> actions;
+    Vector<CharRange, 0, ContentExtensionsOverflowHandler> transitionRanges;
+    Vector<uint32_t, 0, ContentExtensionsOverflowHandler> transitionDestinations;
+    unsigned root { 0 };
+};
+
+inline const CharRange& DFANode::ConstRangeIterator::range() const
+{
+    return dfa.transitionRanges[position];
+}
+
+inline uint32_t DFANode::ConstRangeIterator::target() const
+{
+    return dfa.transitionDestinations[position];
+}
+
+inline const CharRange& DFANode::RangeIterator::range() const
+{
+    return dfa.transitionRanges[position];
+}
+
+inline uint32_t DFANode::RangeIterator::target() const
+{
+    return dfa.transitionDestinations[position];
+}
+
+inline void DFANode::RangeIterator::resetTarget(uint32_t newTarget)
+{
+    dfa.transitionDestinations[position] = newTarget;
+}
+
+} // namespace ContentExtensions
+} // namespace WebCore
+
+#endif // ENABLE(CONTENT_EXTENSIONS)