Make DOMImplementation::hasFeature() behave according to specification

LayoutTests/svg/W3C-SVG-1.1-SE/types-dom-06-f.svg

 <svg id="svg-root" width="100%" height="100%"
   viewBox="0 0 480 360" xmlns="http://www.w3.org/2000/svg"
   xmlns:xlink="http://www.w3.org/1999/xlink" onload="runtest()">
   <!--======================================================================-->
   <!--=  Copyright 2008 World Wide Web Consortium, (Massachusetts          =-->
   <!--=  Institute of Technology, European Research Consortium for         =-->
   <!--=  Informatics and Mathematics (ERCIM), Keio University).            =-->
   <!--=  All Rights Reserved.                                              =-->
   <!--=  See http://www.w3.org/Consortium/Legal/.                          =-->
   <!--======================================================================-->
@@ skipping 43 matching lines @@
                                                 var r2 = document.getElementById("r2");
                                                 var r3 = document.getElementById("r3");
                                                 var i0 = r1.requiredFeatures.getItem(0);
                                                 var i1 = r1.requiredFeatures.getItem(1);
                                                 
                                                 if(i0 != "http://www.w3.org/TR/SVG11/feature#Shape")
                                                 {
                                                         r1.removeAttribute("requiredFeatures");
                                                         return;
                                                 }
-                                                if(i1 != "this.is.a.bogus.feature.string")

[abarth-chromium, 2013/07/26 17:24:25]

There are SVG conformance tests.  Should we be changing the tests themselves or
just our expected behavior?

[do-not-use, 2013/07/26 17:49:29]

Sorry, I updated many SVG tests and I missed that this one was a conformance
test. I rebaselined it instead in the new patch set.

+                                                if(i1 != "http://www.w3.org/TR/SVG11/feature#BogusFeature")
                                                 {
                                                         r1.removeAttribute("requiredFeatures");
                                                         return;
                                                 }
                                                 if(r1.requiredFeatures.numberOfItems != 2)
                                                 {
                                                         r1.removeAttribute("requiredFeatures");
                                                         return;
                                                 }
                                                 r2.requiredFeatures.appendItem(i1);
@@ skipping 31 matching lines @@
                 <text x="50%" y="70" text-anchor="middle">SVGStringList DOM</text>
                 
                 <!-- background images -->
                 <g>
                         <rect width="100" height="100" fill="lime" transform="translate(80 100)"/>
                         <rect width="100" height="100" fill="lime" transform="translate(190 100)"/>
                         <rect width="100" height="100" fill="red" transform="translate(300 100)"/>
                 </g>
                 
                 <!-- tests -->
-                <rect id="r1" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Shape this.is.a.bogus.feature.string" width="100" height="100" fill="red" transform="translate(100 100)"/>
+                <rect id="r1" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Shape http://www.w3.org/TR/SVG11/feature#BogusFeature" width="100" height="100" fill="red" transform="translate(100 100)"/>
                 <rect id="r2" width="100" height="100" fill="red" transform="translate(190 100)"/>
                 <rect id="r3" width="100" height="100" fill="lime" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Shape" transform="translate(300 100)"/>
                 
                 <rect id="fail" width="100%" height="100%" fill="none"/>
   </g>
   <g font-family="SVGFreeSansASCII,sans-serif" font-size="32">
     <text id="revision" x="10" y="340" stroke="none"
       fill="black">$Revision: 1.5 $</text>
   </g>
   <rect id="test-frame" x="1" y="1" width="478" height="358" fill="none" stroke="#000"/>
   <!-- comment out this watermark once the test is approved --><!--
   <g id="draft-watermark">
     <rect x="1" y="1" width="478" height="20" fill="red" stroke="black" stroke-width="1"/>
     <text font-family="SVGFreeSansASCII,sans-serif" font-weight="bold" font-size="20" x="240"
       text-anchor="middle" y="18" stroke-width="0.5" stroke="black" fill="white">DRAFT</text>
   </g>-->
 </svg>