Fix tests broken by default text color change.

sky/tests/lowlevel/iframe.sky

Index: sky/tests/lowlevel/iframe.sky
diff --git a/sky/tests/lowlevel/iframe.sky b/sky/tests/lowlevel/iframe.sky
deleted file mode 100644
index 85c98cf138036a2228dcb510f52fa862af0ee85a..0000000000000000000000000000000000000000
--- a/sky/tests/lowlevel/iframe.sky
+++ /dev/null
@@ -1,15 +0,0 @@
-<sky>
-    <import src="../resources/dump-as-render-tree.sky"/>
-    <iframe id="removeMe" src="text.sky">Should not render</iframe>
-    <p>This is an <iframe style="border-style: solid; border-width: 20px" src="abarth.sky">iframe</iframe> element.</p>
-    <p style="height: 200px">Placeholder.</p>
-    <p>Small iframe should render <iframe style="height: 40px" src="abarth.sky">iframe</iframe> correctly.</p>
-
-    <script>
-    import "dart:sky";
-
-    void main() {
-        document.getElementById("removeMe").remove();
-    }
-    </script>
-</sky>