Consolidate read-only exception throwing for SVG*TearOffs

third_party/WebKit/Source/core/svg/properties/SVGPropertyTearOff.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 12 matching lines @@
  * 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 "core/svg/properties/SVGPropertyTearOff.h"
 
+#include "bindings/core/v8/ExceptionMessages.h"
+#include "bindings/core/v8/ExceptionState.h"
+#include "core/dom/ExceptionCode.h"
 #include "core/svg/SVGElement.h"
 
 namespace blink {
 
+void SVGPropertyTearOffBase::throwReadOnly(ExceptionState& exceptionState)
+{
+    exceptionState.throwDOMException(NoModificationAllowedError, ExceptionMessages::readOnly());
+}
+
 void SVGPropertyTearOffBase::commitChange()
 {
-    ASSERT(!isImmutable());
+    DCHECK(!isImmutable());
     if (!contextElement() || isAnimVal())
         return;
-    ASSERT(m_attributeName != QualifiedName::null());
+    DCHECK(m_attributeName != QualifiedName::null());
     contextElement()->invalidateSVGAttributes();
     contextElement()->svgAttributeBaseValChanged(m_attributeName);
 }
 
 } // namespace blink