Revert 151179 "On IE and FireFox, they treats contenteditable="f..."

LayoutTests/editing/selection/move-by-line-004.html

-<script src="../../fast/js/resources/js-test-pre.js"></script>
-<script src="./resources/js-test-selection-shared.js"></script>
-
-<div id="test" contenteditable="true">
+<p>
+    Test that moving the caret with line granularity within the highest
+    editable root works across non-editable content.
+</p>
+<pre id="console"></pre>
+<div contenteditable="true">
     <div contenteditable="false">
         <span id="pie" contenteditable="true">apple pie</span>
     </div>
     <div contenteditable="false">
         pineapple
     </div>
     <div contenteditable="false">
         <span id="juice" contenteditable="true">apple juice</span>
     </div>
 </div>
+<script>
+    function log(message)
+    {
+        document.getElementById("console").appendChild(document.createTextNode(message + "\n"));
+    }
 
-<script>
-description('Test that moving the caret with line granularity within the highest editable root doesn\'t work across non-editable content.');
+    if (window.testRunner)
+        testRunner.dumpAsText();
 
-testCaretMotion({
-    'direction': 'forward',
-    'granularity': 'line',
-    'origin': 'pie',
-    'originOffset': 3,
-    'target': 'pie',
-    'targetOffset': -1,
-});
+    var fail = false;
+    var pie = document.getElementById("pie");
+    var juice = document.getElementById("juice");
 
-testCaretMotion({
-    'direction': 'backward',
-    'granularity': 'line',
-    'origin': 'juice',
-    'originOffset': 3,
-    'target': 'juice',
-    'targetOffset': 0,
-});
+    var sel = getSelection();
+    sel.setPosition(pie.firstChild, 3);
+    sel.modify("move", "forward", "line");
 
-if (window.testRunner)
-    $('test').outerHTML = '';
+    if (sel.anchorNode !== juice.firstChild || sel.anchorOffset != 3) {
+        log("FAIL: Did not move to the next line");
+        fail = true;
+    }
+
+    sel.setPosition(juice.firstChild, 3);
+    sel.modify("move", "backward", "line");
+
+    if (sel.anchorNode !== pie.firstChild || sel.anchorOffset != 3) {
+        log("FAIL: Did not move to the previous line");
+        fail = true;
+    }
+
+    if (!fail)
+        log("PASS");
 </script>
-<script src="../../fast/js/resources/js-test-post.js"></script>