Change viewport error messages in preparation for use with @viewport rule

Source/core/dom/ViewportArguments.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2012-2013 Intel Corporation. All rights reserved.
  *
@@ skipping 19 matching lines @@
 
 #include "core/page/PageScaleConstraints.h"
 #include "core/platform/graphics/FloatSize.h"
 #include "wtf/Forward.h"
 
 namespace WebCore {
 
 class Document;
 
 enum ViewportErrorCode {
+    InvalidKeyValuePairSeparatorError,
     UnrecognizedViewportArgumentKeyError,
     UnrecognizedViewportArgumentValueError,
     TruncatedViewportArgumentValueError,
     MaximumScaleTooLargeError,
     TargetDensityDpiUnsupported
 };
 
 struct ViewportArguments {
 
     enum Type {
@@ skipping 75 matching lines @@
         return !(*this == other);
     }
 };
 
 void setViewportFeature(const String& keyString, const String& valueString, Document*, void* data);
 void reportViewportWarning(Document*, ViewportErrorCode, const String& replacement1, const String& replacement2);
 
 } // namespace WebCore
 
 #endif // ViewportArguments_h