Don't transfer viewport to an invalid/dirty <use> instance

LayoutTests/svg/custom/use-target-removed.svg

Index: LayoutTests/svg/custom/use-target-removed.svg
diff --git a/LayoutTests/svg/custom/use-target-removed.svg b/LayoutTests/svg/custom/use-target-removed.svg
new file mode 100644
index 0000000000000000000000000000000000000000..07c7d4a37ab83934d85ca6615f2986823dd9d700
--- /dev/null
+++ b/LayoutTests/svg/custom/use-target-removed.svg
@@ -0,0 +1,15 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+  <symbol id="a"/>
+  <use id="b" xlink:href="#a"/>
+  <script>
+    if (window.testRunner)
+        testRunner.dumpAsText();
+    b = document.getElementById('b');
+    b.href.baseVal = "#a";
+    onload = function() {
+        document.getElementById("a").remove();
+        b.setAttribute("width", 100);
+    };
+  </script>
+  <text y="20">PASS: The text is displayed and the file did not trigger a crash.</text>
+</svg>