Remove everything region-specific from LayoutTests.

LayoutTests/fast/regions/no-split-line-box.html

-<!--
-  Each of the two regions should only display two line boxes in this test. 
-  The buggy behavior splits the third line box between the first and second region.
-  --> 
-<script type="text/javascript" charset="utf-8" src="resources/helper.js"></script>
-
-<style type="text/css"> 
-  .article{
-    -webkit-flow-into: thread;
-    line-height:14px;
-  }
-  .region{
-    -webkit-flow-from: thread;
-    width:4em;
-    height:35px;  /*2.5x line height*/
-    background-color:lightgray;
-  }
-  .divider{
-    width:4em;
-    height:10px;
-  }
-  .description{
-    color:blue;
-  }
-</style> 
- 
-<div id="test">
-  <div class="region"></div> 
-  <div class="divider"></div> 
-  <div id="secondRegion" class="region"></div> 
-  <div class="article"> 
-    mnopqr mnopqr <span id="testSpan">m</span>nopqr mnopqr
-  </div>
-  <p class="description">The two regions on either side of the divider should each have two text lines.</p>
-  <p class="description">There should be no text line split between the regions.</p>
-  <p class="description">The top left corner of the third text line should be in the top left corner of the second region.</p>
-</div>
-<div id="result"></div>
-
-<script>
-  if (window.testRunner)
-    testRunner.dumpAsText();
-    
-  var testElement = document.getElementById("testSpan")
-  var testRect = testElement.getBoundingClientRect();
-  var regionElement = document.getElementById("secondRegion")
-  var regionRect = regionElement.getBoundingClientRect();
-  var resultString = assertTopLeftMatch (regionRect, testRect);
-
-  if (window.testRunner)
-        document.getElementById("test").innerText="";
-  var resultDiv = document.getElementById("result");
-  resultDiv.innerText = resultString;
-</script>