Revert "Get rid of unnecessary layouts on body elements with quirky children"

PerformanceTests/Layout/resources/body_relayout.js

-(function() {
-    function createElement(tag, parent, className, id) {
-        var el = document.createElement(tag);
-        el.className = className;
-        if (id)
-            el.id = id;
-        parent.appendChild(el);
-        return el;
-    }
-
-    function createSet(width, height, nested) {
-        var container = createElement("div", document.body, "container");
-        for (var y = 0; y < height; ++y) {
-            createElement("div", container, "float", "float" + x + "_" + y);
-            for (var x = 0; x < width; ++x)
-                createElement("div", container, "normal", "normal" + x + "_" + y);
-
-            var nestedContainer = container;
-            for ( ; nested > 0; --nested)
-                nestedContainer = createElement("div", nestedContainer, "normal", "normal" + x + "_" + nested);
-        }
-        return container;
-    }
-
-    function createTestFunction(width, height, nested, runs) {
-        var container = createSet(width, height, nested);
-        nested = nested || 0;
-        runs = runs || 10;
-        return function() {
-            for (var i = 0; i < runs; ++i) {
-                // Force a layout.
-                var body = document.getElementById("body")
-                body.style['height'] = 800 + i + "px";
-                document.body.offsetTop;
-            }
-            PerfTestRunner.resetRandomSeed();
-        }
-    }
-
-    window.createBodyRelayoutTestFunction = createTestFunction;
-})();