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diff --git a/Source/WebCore/contentextensions/ContentExtensionError.cpp b/Source/WebCore/contentextensions/ContentExtensionError.cpp
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+++ b/Source/WebCore/contentextensions/ContentExtensionError.cpp
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+/*
+ * Copyright (C) 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.
+ */
+
+#include "config.h"
+#include "ContentExtensionError.h"
+
+#if ENABLE(CONTENT_EXTENSIONS)
+
+#include <string>
+#include <wtf/NeverDestroyed.h>
+
+namespace WebCore {
+namespace ContentExtensions {
+
+const char* WebKitContentBlockerDomain = "WebKitContentBlockerDomain";
+
+const std::error_category& contentExtensionErrorCategory()
+{
+    class ContentExtensionErrorCategory : public std::error_category {
+        const char* name() const noexcept override
+        {
+            return "content extension";
+        }
+
+        std::string message(int errorCode) const override
+        {
+            switch (static_cast<ContentExtensionError>(errorCode)) {
+            case ContentExtensionError::JSONInvalid:
+                return "Failed to parse the JSON String.";
+            case ContentExtensionError::JSONTopLevelStructureNotAnObject:
+                return "Invalid input, the top level structure is not an object.";
+            case ContentExtensionError::JSONTopLevelStructureNotAnArray:
+                return "Invalid input, the top level structure is not an array.";
+            case ContentExtensionError::JSONInvalidObjectInTopLevelArray:
+                return "Invalid object in the top level array.";
+            case ContentExtensionError::JSONInvalidRule:
+                return "Invalid rule.";
+            case ContentExtensionError::JSONContainsNoRules:
+                return "Empty extension.";
+            case ContentExtensionError::JSONInvalidTrigger:
+                return "Invalid trigger object.";
+            case ContentExtensionError::JSONInvalidURLFilterInTrigger:
+                return "Invalid url-filter object.";
+            case ContentExtensionError::JSONInvalidTriggerFlagsArray:
+                return "Invalid trigger flags array.";
+            case ContentExtensionError::JSONInvalidObjectInTriggerFlagsArray:
+                return "Invalid object in the trigger flags array.";
+            case ContentExtensionError::JSONInvalidStringInTriggerFlagsArray:
+                return "Invalid string in the trigger flags array.";
+            case ContentExtensionError::JSONInvalidAction:
+                return "Invalid action object.";
+            case ContentExtensionError::JSONInvalidActionType:
+                return "Invalid action type.";
+            case ContentExtensionError::JSONInvalidCSSDisplayNoneActionType:
+                return "Invalid css-display-none action type. Requires a selector.";
+            case ContentExtensionError::JSONInvalidRegex:
+                return "Invalid or unsupported regular expression.";
+            case ContentExtensionError::JSONInvalidDomainList:
+                return "Invalid domain list.";
+            case ContentExtensionError::JSONTooManyRules:
+                return "Too many rules in JSON array.";
+            case ContentExtensionError::JSONDomainNotLowerCaseASCII:
+                return "Domains must be lower case ASCII. Use punycode to encode non-ASCII characters.";
+            case ContentExtensionError::JSONUnlessAndIfDomain:
+                return "A trigger cannot have both unless- and if-domain.";
+            }
+
+            return std::string();
+        }
+    };
+
+    static NeverDestroyed<ContentExtensionErrorCategory> contentExtensionErrorCategory;
+    return contentExtensionErrorCategory;
+}
+
+} // namespace ContentExtensions
+} // namespace WebCore
+
+#endif // ENABLE(CONTENT_EXTENSIONS)