SVG animate should respect attribute 'restart=never'.

Source/core/svg/animation/SVGSMILElement.cpp

Index: Source/core/svg/animation/SVGSMILElement.cpp
diff --git a/Source/core/svg/animation/SVGSMILElement.cpp b/Source/core/svg/animation/SVGSMILElement.cpp
index 719cd493840b94a7801b10273ec43467b5cb4cea..e861da6ec2440e7350feface02e0ff7b80bfd56d 100644
--- a/Source/core/svg/animation/SVGSMILElement.cpp
+++ b/Source/core/svg/animation/SVGSMILElement.cpp
@@ -943,6 +943,13 @@ SMILTime SVGSMILElement::nextProgressTime() const
 
 void SVGSMILElement::beginListChanged(SMILTime eventTime)
 {
+    if (!m_isWaitingForFirstInterval && m_activeState != Active && this->restart() == RestartNever) {
+        m_nextProgressTime = SMILTime::unresolved();
+        m_interval.begin = SMILTime::unresolved();
+        m_interval.end = SMILTime::unresolved();
+        return;
+    }
+
     if (m_isWaitingForFirstInterval)
         resolveFirstInterval();
     else {