Remove CSS regions support, keeping a bare minimum to support "region-based" multicol.

LayoutTests/fast/regions/resources/region-style.css

Index: LayoutTests/fast/regions/resources/region-style.css
diff --git a/LayoutTests/fast/regions/resources/region-style.css b/LayoutTests/fast/regions/resources/region-style.css
deleted file mode 100644
index e70f36a674320ac51376522cf875ac73d6c5b738..0000000000000000000000000000000000000000
--- a/LayoutTests/fast/regions/resources/region-style.css
+++ /dev/null
@@ -1,160 +0,0 @@
-.redBox {
-    width: 50px;
-    height: 50px;
-    background-color: red;
-}
-
-.greenBox {
-    width: 50px;
-    height: 50px;
-    background-color: green;
-}
-
-.blueBox {
-    width: 50px;
-    height: 50px;
-    background-color: blue;
-}
-
-.orangeBox {
-    width: 50px;
-    height: 50px;
-    background-color: orange;
-}
-
-.flowArticle {
-    -webkit-flow-into: article;
-}
-
-.regionArticle {
-    -webkit-flow-from: article;
-}
-
-.regionArticleAfter::after {
-    display: block;
-    width: 50px;
-    height: 50px;
-    content: 'This text should not be displayed';
-    border: 1px solid black;
-    -webkit-flow-from: article;
-}
-
-.regionArticleBefore::before {
-    display: block;
-    width: 50px;
-    height: 50px;
-    border: 1px solid black;
-    -webkit-flow-from: article;
-}
-
-.borderBox {
-    width: 50px;
-    height: 50px;
-    float: left;
-    border: 1px solid black;
-}
-
-.borderBoxNoFloat {
-    width: 50px;
-    height: 50px;
-    border: 1px solid black;
-}
-
-.pass {
-    font-weight: bold;
-    color: green;
-}
-
-.fail, .error {
-    font-weight: bold;
-    color: red;
-}
-
-.break {
-    -webkit-region-break-before: always;
-    display: block;
-}
-
-.token {
-    color: blue;
-    font-weight: bold;
-}
-
-.description {
-    width: 600px;
-}
-
-.bigBox {
-    height: 100px;
-    width: 300px;
-}
-
-.greyBigBox {
-    height: 100px;
-    width: 300px;
-    background-color: lightgrey;
-}
-
-.descriptionVertical {
-    height: 600px;
-}
-
-.bigBoxVertical {
-    height: 300px;
-    width: 100px;
-}
-
-.greyBigBoxVertical {
-    height: 300px;
-    width: 100px;
-    background-color: lightgrey;
-}
-
-.floatLeft {
-    float: left;
-}
-
-.floatRight {
-    float: right;
-}
-
-.clear {
-    clear: both;
-}
-
-/* regions create Stacking Contexts */
-.forcedStackingContext {
-    position: relative;
-    z-index: 1;
-}
-
-/* overflow tests styles */
-.overflowContentFlow {
-    -webkit-flow-into: flow1;
-    padding: 5px;
-}
-
-.overflowContent {
-    padding: 5px;
-}
-
-.overflowBox {
-    width: 30px;
-    height: 50px;
-    background-color: lime;
-}
-
-.overflowBox2 {
-    width: 50px;
-    height: 50px;
-    background-color: lime;
-}
-
-.overflowFirstBox {
-    border: 1px solid blue;
-}
-
-.overflowSecondBox {
-    border: 1px solid green;
-    overflow: hidden;
-}