Remove everything region-specific from LayoutTests.

LayoutTests/fast/regions/hit-test-region.html

-<style type="text/css">
-#content { -webkit-flow-into: article; }
-.region{
-    -webkit-flow-from: article;
-    width:200px;
-    height:500px;
-    float:left;
-    margin: 50px;
-}
-#target { width: 50px; height: 50px; background-color: red; margin: 10px; }
-#target:hover { background-color: green; }
-</style>
-<p>
-    Test for <i><a href="https://bugs.webkit.org/show_bug.cgi?id=76456">https://bugs.webkit.org/show_bug.cgi?id=76456</a>
-    Inconsistent text selection behavior in regions</i>.
-</p>
-<p>
-    The red square should turn green when hovered.
-</p>
-<div id="region1" class="region"></div>
-<div id="region2" class="region"></div>
-
-<div id="content" style="outline: solid black">
-    <div>
-        <div style="height: 800px; background-color: purple;"></div>
-        <div style="float: right; background-color: lightyellow; margin: 5px;">
-            <div id="target"></div>
-        </div>
-    </div>
-</div>
-<div id="result" style="clear:both">FAIL: Test did not run.</div>
-<script>
-    if (window.testRunner)
-        testRunner.dumpAsText();
-
-    var result = document.getElementById("result");
-    var hitElement = document.elementFromPoint(520, 465);
-    if (hitElement === document.getElementById("target"))
-        result.innerText = "PASS";
-    else
-        result.innerText = "FAIL: Hit " + hitElement;
-</script>