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diff --git a/Source/WebCore/contentextensions/ContentExtensionStyleSheet.cpp b/Source/WebCore/contentextensions/ContentExtensionStyleSheet.cpp
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+++ b/Source/WebCore/contentextensions/ContentExtensionStyleSheet.cpp
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+/*
+ * Copyright (C) 2015-2016 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.
+ */
+
+#include "config.h"
+#include "ContentExtensionStyleSheet.h"
+
+#if ENABLE(CONTENT_EXTENSIONS)
+
+#include "CSSStyleSheet.h"
+#include "ContentExtensionsBackend.h"
+#include "Document.h"
+#include "StyleSheetContents.h"
+#include <wtf/text/StringBuilder.h>
+
+namespace WebCore {
+namespace ContentExtensions {
+
+ContentExtensionStyleSheet::ContentExtensionStyleSheet(Document& document)
+    : m_styleSheet(CSSStyleSheet::create(StyleSheetContents::create(), document))
+{
+    m_styleSheet->contents().setIsUserStyleSheet(true);
+}
+
+ContentExtensionStyleSheet::~ContentExtensionStyleSheet()
+{
+    m_styleSheet->clearOwnerNode();
+}
+
+bool ContentExtensionStyleSheet::addDisplayNoneSelector(const String& selector, uint32_t selectorID)
+{
+    ASSERT(selectorID != std::numeric_limits<uint32_t>::max());
+
+    if (!m_addedSelectorIDs.add(selectorID).isNewEntry)
+        return false;
+
+    StringBuilder css;
+    css.append(selector);
+    css.append('{');
+    css.append(ContentExtensionsBackend::displayNoneCSSRule());
+    css.append('}');
+    m_styleSheet->contents().parseString(css.toString());
+    return true;
+}
+
+} // namespace ContentExtensions
+} // namespace WebCore
+
+#endif // ENABLE(CONTENT_EXTENSIONS)