DevTools: do not use internals for highlight testing, use protocol instead.

LayoutTests/http/tests/inspector/elements-test.js

 var initialize_ElementTest = function() {
 
 InspectorTest.findNode = function(matchFunction, callback)
 {
     callback = InspectorTest.safeWrap(callback);
     var result = null;
     var pendingRequests = 0;
     function processChildren(node)
     {
         try {
@@ skipping 717 matching lines @@
 {
     // Click "Add new rule".
     document.getElementById("add-style-button-test-id").click();
     var section = WebInspector.panels.elements.sidebarPanes.styles.sections[0][2];
     if (typeof selector === "string")
         section._selectorElement.textContent = selector;
     section._selectorElement.dispatchEvent(InspectorTest.createKeyEvent("Enter"));
     InspectorTest.addSniffer(WebInspector.BlankStylePropertiesSection.prototype, "makeNormal", callback);
 }
 
+InspectorTest.dumpInspectorHighlight = function(node, callback)
+{
+    node.boxModel(function(boxModel) {
+        var rectNames = ["margin", "border", "padding", "content"];
+        for (var i = 0; i < rectNames.length; i++) {
+            var rect = boxModel[rectNames[i]];
+            InspectorTest.addResult(rectNames[i] + " rect is " + (rect[4] - rect[0]) + " x " + (rect[5] - rect[1]) + " at (" + rect[0] + ", " + rect[1] + ")");
+        }
+        callback();
+    });
+}
+
 };
-
-function dumpInspectorHighlightRects()
-{
-    var rectNames = ["margin", "border", "padding", "content"];
-    var rects = window.internals.inspectorHighlightRects(document);
-    for (var i = 0; i < rects.length; i++)
-    {
-        var rectName = (i < rectNames.length ? rectNames[i] : "untitled");
-        var rect = rects.item(i);
-        output(rectName + " rect is " + rect.width + " x " + rect.height + " at (" + rect.left + ", " + rect.top + ")");
-    }
-}