Selection API: setBaseAndExtent() and selectAllChildren() should create new Range based on the spec…

third_party/WebKit/LayoutTests/editing/selection/legal-positions.html

 <script>
 if (window.testRunner)
      testRunner.dumpEditingCallbacks();
 </script>
 
 <script>
 function log(str) {
     var li = document.createElement("li");
     li.appendChild(document.createTextNode(str));
     var console = document.getElementById("console");
@@ skipping 15 matching lines @@
 var s = window.getSelection();
 var e = document.getElementById("test");
 var r;
 
 if (window.testRunner)
     window.testRunner.dumpAsText();
 
 // The textnode
 s.setBaseAndExtent(e, 0, e, 1);
 r = s.getRangeAt(0);
-assert(r.startContainer == e.childNodes[0]);
+assert(r.startContainer == e);
 assert(r.startOffset == 0);
-assert(r.endContainer == e.childNodes[0]);
-assert(r.endOffset == r.endContainer.length);
+assert(r.endContainer == e);
+assert(r.endOffset == 1);
 
 // The image
 s.setBaseAndExtent(e, 1, e, 2);
 r = s.getRangeAt(0);
 assert(r.startContainer == e);
 assert(r.startOffset == 1);
 assert(r.endContainer == e);
 assert(r.endOffset == 2);
 
 // The <object>
 s.setBaseAndExtent(e, 2, e, 3);
 r = s.getRangeAt(0);
 assert(r.startContainer == e);
 assert(r.startOffset == 2);
 assert(r.endContainer == e);
 assert(r.endOffset == 3);
 
 // The <br>
 s.setBaseAndExtent(e, 4, e, 5);
 r = s.getRangeAt(0);
 assert(r.startContainer == e);
 assert(r.startOffset == 4);
 assert(r.endContainer == e);
 assert(r.endOffset == 5);
 
 </script>