Make DOMImplementation.hasFeature() always return true.

LayoutTests/svg/custom/required-feature-vs-has-feature.svg

Index: LayoutTests/svg/custom/required-feature-vs-has-feature.svg
diff --git a/LayoutTests/svg/custom/required-feature-vs-has-feature.svg b/LayoutTests/svg/custom/required-feature-vs-has-feature.svg
deleted file mode 100644
index a69f527186105006474e1c5571c16372f4535b3f..0000000000000000000000000000000000000000
--- a/LayoutTests/svg/custom/required-feature-vs-has-feature.svg
+++ /dev/null
@@ -1,17 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg">
-    <title>The requiredFeatures attribute and the hasFeature() API should be in agreement</title>
-    <text x="20" y="20" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Filter">This text should be visible</text>
-    <text x="20" y="40" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Font">This text should not be visible</text>
-    <text x="20" y="60" class="Filter">This text should be visible</text>
-    <text x="20" y="80" class="Font">This text should not be visible</text>
-    <script><![CDATA[
-        var textElements = document.querySelectorAll("text[class]");
-        Array.prototype.forEach.call(textElements, function(text)
-        {
-            var feature = "http://www.w3.org/TR/SVG11/feature#" + text.getAttribute("class");
-            if (!document.implementation.hasFeature(feature, null)) {
-                text.parentNode.removeChild(text);
-            }
-        });
-    ]]></script>
-</svg>