Timeline: get rid of some rarely used test helper methods

third_party/WebKit/LayoutTests/inspector/tracing/timeline-misc/timeline-model.html

Index: third_party/WebKit/LayoutTests/inspector/tracing/timeline-misc/timeline-model.html
diff --git a/third_party/WebKit/LayoutTests/inspector/tracing/timeline-misc/timeline-model.html b/third_party/WebKit/LayoutTests/inspector/tracing/timeline-misc/timeline-model.html
index 3973c64f4e1fdc9a3b4d882653b547aed3e0a49b..d72855c4332a5f07de59a26b9fc1b955b12e9312 100644
--- a/third_party/WebKit/LayoutTests/inspector/tracing/timeline-misc/timeline-model.html
+++ b/third_party/WebKit/LayoutTests/inspector/tracing/timeline-misc/timeline-model.html
@@ -52,12 +52,11 @@ function test()
     ];
 
     var tracingTimelineModel = InspectorTest.createTimelineModelWithEvents(commonMetadata.concat(traceEvents));
-    var records = tracingTimelineModel.records();
-    var topLevelRecordsCount = 2;
-    InspectorTest.assertEquals(topLevelRecordsCount, records.length);
-    for (var i = 0; i < records.length; ++i) {
-        InspectorTest.dumpTimelineModelRecord(records[i]);
-    }
+    InspectorTest.forAllEvents(tracingTimelineModel.mainThreadEvents(), (event, stack) => {
+        const prefix = Array(stack.length + 1).join("----") + (stack.length ? "> " : "");
+        const details = Timeline.TimelineUIUtils.buildDetailsTextForTraceEvent(event, null) || "";
+        InspectorTest.addResult(`${prefix}${event.name}: ${details}`);
+    });
     InspectorTest.completeTest();
 }