Remove GardeningServer.

Tools/GardeningServer/ui/test/ct-popout-iframe.html

-<!--
-Copyright 2014 The Chromium Authors. All rights reserved.
-Use of this source code is governed by a BSD-style license that can be
-found in the LICENSE file.
--->
-
-<link rel="import" href="../ct-popout-iframe.html">
-
-<script>
-(function() {
-
-var assert = chai.assert;
-
-describe('ct-popout-iframe', function() {
-  it('has iframe and link', function() {
-    var elem = document.createElement('ct-popout-iframe');
-
-    var iframes = elem.shadowRoot.querySelectorAll('iframe');
-    assert.lengthOf(iframes, 1);
-
-    var links = elem.shadowRoot.querySelectorAll('a');
-    assert.lengthOf(links, 1);
-
-    var thisHref = location.href;
-    assert.equal(iframes[0].src, thisHref);
-    assert.equal(links[0].href, thisHref);
-
-    var url = 'https://example.com/results.txt';
-    elem.src = url;
-
-    describe('src', function() {
-      it('set to a URL', function() {
-        assert.equal(iframes[0].src, url);
-        assert.equal(links[0].href, url);
-      });
-    });
-  });
-});
-
-})();
-</script>