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

LayoutTests/fast/regions/script-tests/region-element-display-restriction.js

Index: LayoutTests/fast/regions/script-tests/region-element-display-restriction.js
diff --git a/LayoutTests/fast/regions/script-tests/region-element-display-restriction.js b/LayoutTests/fast/regions/script-tests/region-element-display-restriction.js
deleted file mode 100644
index 69f549f6119b69f2cd187563daae5d03dcade573..0000000000000000000000000000000000000000
--- a/LayoutTests/fast/regions/script-tests/region-element-display-restriction.js
+++ /dev/null
@@ -1,35 +0,0 @@
-description("Test that only non-replaced block elements can be transformed into regions.");
-
-function createRegionElement(elementType, displayType)
-{
-    var element = document.createElement(elementType);
-    var textElement = document.createTextNode("inside element");
-    element.appendChild(textElement);
-    element.style.setProperty("display", displayType);
-    document.body.appendChild(element);
-
-    // Transform the element into a region.
-    element.style.setProperty("-webkit-flow-from", "no-flow");
-
-    // The region element was created if the length of inner text is 0.
-    var regionCreated = element.innerText.length == 0;
-
-    document.body.removeChild(element);
-
-    return regionCreated;
-}
-
-shouldBeFalse('createRegionElement("div", "none")');
-shouldBeTrue('createRegionElement("div", "block")');
-shouldBeTrue('createRegionElement("div", "inline-block")');
-shouldBeFalse('createRegionElement("div", "inline")');
-shouldBeFalse('createRegionElement("div", "table")');
-shouldBeFalse('createRegionElement("div", "inline-table")');
-shouldBeTrue('createRegionElement("div", "table-cell")');
-shouldBeTrue('createRegionElement("div", "table-caption")');
-shouldBeTrue('createRegionElement("div", "list-item")');
-shouldBeFalse('createRegionElement("div", "-webkit-box")');
-shouldBeFalse('createRegionElement("div", "-webkit-inline-box")');
-shouldBeFalse('createRegionElement("div", "-webkit-flex")');
-shouldBeFalse('createRegionElement("div", "-webkit-inline-flex")');
-// FIXME: Also add grid and inline grid when it is enabled by default