Allow <use> inside author shadow roots

Source/core/svg/SVGElement.cpp

Index: Source/core/svg/SVGElement.cpp
diff --git a/Source/core/svg/SVGElement.cpp b/Source/core/svg/SVGElement.cpp
index 1e9e5b0f3676a563c08b6c5956ece3cf10093e87..fdfd69b08660c578cce3ca5d218f0c6adb573abf 100644
--- a/Source/core/svg/SVGElement.cpp
+++ b/Source/core/svg/SVGElement.cpp
@@ -236,10 +236,6 @@ String SVGElement::title() const
     // Walk up the tree, to find out whether we're inside a <use> shadow tree, to find the right title.
     if (isInShadowTree()) {
         Element* shadowHostElement = toShadowRoot(treeScope().rootNode()).host();
-        // At this time, SVG nodes are not allowed in non-<use> shadow trees, so any shadow root we do
-        // have should be a use. The assert and following test is here to catch future shadow DOM changes
-        // that do enable SVG in a shadow tree.
-        ASSERT(!shadowHostElement || isSVGUseElement(*shadowHostElement));
         if (isSVGUseElement(shadowHostElement)) {
             SVGUseElement& useElement = toSVGUseElement(*shadowHostElement);