Replace Selection.collapse() with Selection.removeAllRanges() in layout tests..

LayoutTests/fast/html/script-tests/article-element.js

 description('Various tests for the article element.');
 
 var testParent = document.createElement('div');
 document.body.appendChild(testParent);
 
 debug('<article> closes <p>:');
 testParent.innerHTML = '<p>Test that <article id="article1">an article element</article> closes &lt;p>.</p>';
 var article1 = document.getElementById('article1');
 shouldBeFalse('article1.parentNode.nodeName == "p"');
 
@@ skipping 17 matching lines @@
 document.body.removeChild(testParent);
 
 debug('FormatBlock:');
 var editable = document.createElement('div');
 editable.innerHTML = '[<span id="span2">The text will be a child of &lt;article>.</span>]';
 document.body.appendChild(editable);
 editable.contentEditable = true;
 var selection = window.getSelection();
 selection.selectAllChildren(editable);
 document.execCommand('FormatBlock', false, 'article');
-selection.collapse();
+selection.removeAllRanges();
 shouldBe('document.getElementById("span2").parentNode.nodeName', '"ARTICLE"');
 document.body.removeChild(editable);