[Devtools] Cleanup DataGrid's typecast and identifier naming

third_party/WebKit/LayoutTests/inspector/profiler/heap-snapshot-comparison-sorting.html

Index: third_party/WebKit/LayoutTests/inspector/profiler/heap-snapshot-comparison-sorting.html
diff --git a/third_party/WebKit/LayoutTests/inspector/profiler/heap-snapshot-comparison-sorting.html b/third_party/WebKit/LayoutTests/inspector/profiler/heap-snapshot-comparison-sorting.html
index b24ed26dd205fd57d6b530d717b35c7647967fc2..9187c33f63bcc4ff51418b471610cd475c463cec 100644
--- a/third_party/WebKit/LayoutTests/inspector/profiler/heap-snapshot-comparison-sorting.html
+++ b/third_party/WebKit/LayoutTests/inspector/profiler/heap-snapshot-comparison-sorting.html
@@ -59,8 +59,8 @@ function test()
                 var sortTypes = { object: "text",
                                   addedCount: "number", removedCount: "number", countDelta: "number",
                                   addedSize: "size", removedSize: "size", sizeDelta: "size" };
-                InspectorTest.assertEquals(true, !!sortTypes[columns[currentColumn].identifier], "sort by identifier");
-                InspectorTest.checkArrayIsSorted(contents, sortTypes[columns[currentColumn].identifier], columns[currentColumn].sort);
+                InspectorTest.assertEquals(true, !!sortTypes[columns[currentColumn].id], "sort by id");
+                InspectorTest.checkArrayIsSorted(contents, sortTypes[columns[currentColumn].id], columns[currentColumn].sort);
 
                 if (!currentColumnOrder)
                     currentColumnOrder = true;