Remove everything region-specific from LayoutTests.

LayoutTests/fast/repaint/overflow-flipped-writing-mode-block-in-regions.html

Index: LayoutTests/fast/repaint/overflow-flipped-writing-mode-block-in-regions.html
diff --git a/LayoutTests/fast/repaint/overflow-flipped-writing-mode-block-in-regions.html b/LayoutTests/fast/repaint/overflow-flipped-writing-mode-block-in-regions.html
deleted file mode 100644
index 56ca8ab71876de464cfeb1a72bad39ec6ee33bb7..0000000000000000000000000000000000000000
--- a/LayoutTests/fast/repaint/overflow-flipped-writing-mode-block-in-regions.html
+++ /dev/null
@@ -1,18 +0,0 @@
-<script src="resources/repaint.js"></script>
-<script>
-    if (window.testRunner)
-        window.testRunner.overridePreference("WebKitCSSRegionsEnabled", "1");
-    onload = runRepaintTest;
-
-    function repaintTest()
-    {
-        document.getElementById("target").style.visibility = "hidden";
-    }
-</script>
-<div style="-webkit-flow-into: thread; height: 100px; width: 100px; background-color: red; -webkit-writing-mode: horizontal-bt;">
-    <div style="height: 25px;">
-        <div style="height: 100px; background-color: green;"></div>
-    </div>
-</div>
-<div id="target" style="-webkit-flow-into: thread; height: 50px; width: 100px; background-color: red; margin-top: -100px;"></div>
-<div style="-webkit-flow-from: thread; width:100px;height:400px; border:2px solid black; position:absolute; left:100px; top:100px"></div>