Use initial values for flood/lighting-color/flood-opacity when detached

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

Index: third_party/WebKit/Source/core/svg/SVGFEDropShadowElement.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGFEDropShadowElement.cpp b/third_party/WebKit/Source/core/svg/SVGFEDropShadowElement.cpp
index 24775e128e36b86bfa9db5dbe66bbbbb282017b1..3a7817a54f44b465fad3802214e6aa21fac2cbb9 100644
--- a/third_party/WebKit/Source/core/svg/SVGFEDropShadowElement.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGFEDropShadowElement.cpp
@@ -76,15 +76,15 @@ void SVGFEDropShadowElement::svgAttributeChanged(const QualifiedName& attrName)
 
 PassRefPtrWillBeRawPtr<FilterEffect> SVGFEDropShadowElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
 {
-    LayoutObject* layoutObject = this->layoutObject();
-    if (!layoutObject)
-        return nullptr;
-
-    ASSERT(layoutObject->style());
-    const SVGComputedStyle& svgStyle = layoutObject->style()->svgStyle();
+    Color color = Color::black;
+    float opacity = 1;
+    if (LayoutObject* layoutObject = this->layoutObject()) {
+        ASSERT(layoutObject->style());
+        const SVGComputedStyle& svgStyle = layoutObject->styleRef().svgStyle();
 
-    Color color = svgStyle.floodColor();
-    float opacity = svgStyle.floodOpacity();
+        color = svgStyle.floodColor();
+        opacity = svgStyle.floodOpacity();
+    }
 
     FilterEffect* input1 = filterBuilder->getEffectById(AtomicString(m_in1->currentValue()->value()));
     if (!input1)