Hoist some pre-condition checks out of SVGAngle/SVGEnumeration

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

Index: third_party/WebKit/Source/core/svg/SVGAngle.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGAngle.cpp b/third_party/WebKit/Source/core/svg/SVGAngle.cpp
index 9189ceb60d04364fda502e76b7cdd4bb09027f70..930130cef4dd0f6b5926a37727c3446126e9aca9 100644
--- a/third_party/WebKit/Source/core/svg/SVGAngle.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGAngle.cpp
@@ -277,13 +277,8 @@ void SVGAngle::newValueSpecifiedUnits(SVGAngleType unitType, float valueInSpecif
     m_valueInSpecifiedUnits = valueInSpecifiedUnits;
 }
 
-void SVGAngle::convertToSpecifiedUnits(SVGAngleType unitType, ExceptionState& exceptionState)
+void SVGAngle::convertToSpecifiedUnits(SVGAngleType unitType)
 {
-    if (m_unitType == SVG_ANGLETYPE_UNKNOWN) {
-        exceptionState.throwDOMException(NotSupportedError, "Cannot convert from unknown or invalid units.");
-        return;
-    }
-
     if (unitType == m_unitType)
         return;