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

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

Index: third_party/WebKit/Source/core/svg/SVGLengthTearOff.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGLengthTearOff.cpp b/third_party/WebKit/Source/core/svg/SVGLengthTearOff.cpp
index 178046be9ddfa528971fe49db29a9ca3e5fdbba7..ebff1f65177f326445c48f10344a3d3bf6ab2c7d 100644
--- a/third_party/WebKit/Source/core/svg/SVGLengthTearOff.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGLengthTearOff.cpp
@@ -138,7 +138,13 @@ void SVGLengthTearOff::setValue(float value, ExceptionState& exceptionState)
         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();
 }