Convert editing/pasteboard/merge-after-delete*.html to use w3c test harness

third_party/WebKit/LayoutTests/editing/pasteboard/merge-after-delete-1.html

-<script>
-if (window.testRunner)
-     testRunner.dumpEditingCallbacks();
-</script>
-<style>
-div {
-    border: 1px solid black;
-    margin: 2px;
-}
-</style>
-<p>When ReplaceSelectionCommand deletes the current selection, it should request that the deletion do a merge in some cases (normally, though, it should ask that a merge not be done, because a merge will cause information about block nesting to be lost).  It wasn't requesting a merge in cases where it should have.</p>
-<p>The failing case is where the incoming fragment has more than one block, and the selection being pasted into ends at the end of a paragraph.  Any time the selection being pasted into ends at the end of a paragraph, deleting will leave leave a) a br or b) an empty block at the end of the deleted selection.  So, not merging will leave an extraneous empty line or a collapsed block after the paste operation.</p>
-<div id="test" contenteditable="true"><div style="border: 1px solid red;">bar</div><div style="border: 1px solid blue;">bar<br></div></div>
-
-<script>
-var s = window.getSelection();
-var e = document.getElementById("test");
-
-s.collapse(e, 0);
-s.modify("move", "forward", "character");
-s.modify("extend", "forward", "line");
-s.modify("extend", "forward", "line");
-document.execCommand("InsertHTML", false, "<div>foo</div><div>bar</div>");
-</script>