Revert "SVGLength.value setter should set the value to <number>"

third_party/WebKit/Source/core/svg/SVGLengthTearOff.cpp

 /*
  * Copyright (C) 2014 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 120 matching lines @@
     return target()->value(lengthContext);
 }
 
 void SVGLengthTearOff::setValue(float value, ExceptionState& exceptionState)
 {
     if (isImmutable()) {
         exceptionState.throwDOMException(NoModificationAllowedError, "The attribute is read-only.");
         return;
     }
 
-    target()->setValueAsNumber(value);
+    if (target()->isRelative() && !canResolveRelativeUnits(contextElement())) {
+        exceptionState.throwDOMException(NotSupportedError, "Could not resolve relative length.");
+        return;
+    }
+
+    SVGLengthContext lengthContext(contextElement());
+    target()->setValue(value, lengthContext);
     commitChange();
 }
 
 float SVGLengthTearOff::valueInSpecifiedUnits()
 {
     return target()->valueInSpecifiedUnits();
 }
 
 void SVGLengthTearOff::setValueInSpecifiedUnits(float value, ExceptionState& exceptionState)
 {
@@ skipping 77 matching lines @@
     : SVGPropertyTearOff<SVGLength>(target, contextElement, propertyIsAnimVal, attributeName)
 {
 }
 
 DEFINE_TRACE_WRAPPERS(SVGLengthTearOff)
 {
     visitor->traceWrappers(contextElement());
 }
 
 } // namespace blink