Update error-handling for fe*Lighting and feTurbulence

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

Index: third_party/WebKit/Source/core/svg/SVGFESpecularLightingElement.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGFESpecularLightingElement.cpp b/third_party/WebKit/Source/core/svg/SVGFESpecularLightingElement.cpp
index 9184b4300fb25a1e4f9df2c1c185d66cb1f8e3cd..09f2cc530576208c59ab9401c2cb3f218c6daf29 100644
--- a/third_party/WebKit/Source/core/svg/SVGFESpecularLightingElement.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGFESpecularLightingElement.cpp
@@ -132,10 +132,6 @@ PassRefPtrWillBeRawPtr<FilterEffect> SVGFESpecularLightingElement::build(SVGFilt
     if (!input1)
         return nullptr;
 
-    SVGFELightElement* lightNode = SVGFELightElement::findLightElement(*this);
-    if (!lightNode)
-        return nullptr;
-
     LayoutObject* layoutObject = this->layoutObject();
     if (!layoutObject)
         return nullptr;
@@ -143,9 +139,15 @@ PassRefPtrWillBeRawPtr<FilterEffect> SVGFESpecularLightingElement::build(SVGFilt
     ASSERT(layoutObject->style());
     Color color = layoutObject->style()->svgStyle().lightingColor();
 
-    RefPtr<LightSource> lightSource = lightNode->lightSource(filter);
-    RefPtrWillBeRawPtr<FilterEffect> effect = FESpecularLighting::create(filter, color, m_surfaceScale->currentValue()->value(), m_specularConstant->currentValue()->value(),
-        m_specularExponent->currentValue()->value(), lightSource.release());
+    const SVGFELightElement* lightNode = SVGFELightElement::findLightElement(*this);
+    RefPtr<LightSource> lightSource = lightNode ? lightNode->lightSource(filter) : nullptr;
+
+    RefPtrWillBeRawPtr<FilterEffect> effect = FESpecularLighting::create(filter,
+        color,
+        m_surfaceScale->currentValue()->value(),
+        m_specularConstant->currentValue()->value(),
+        m_specularExponent->currentValue()->value(),
+        lightSource.release());
     effect->inputEffects().append(input1);
     return effect.release();
 }