DevTools: move tracing based Timeline out of experiment

LayoutTests/inspector/timeline/timeline-load-event-expected.txt

Index: LayoutTests/inspector/timeline/timeline-load-event-expected.txt
diff --git a/LayoutTests/inspector/timeline/timeline-load-event-expected.txt b/LayoutTests/inspector/timeline/timeline-load-event-expected.txt
index bb53d759b89c8a7f631cc642454da9587fd5bf5c..e781a6c26877d840f401ff0998439e042b380dd7 100644
--- a/LayoutTests/inspector/timeline/timeline-load-event-expected.txt
+++ b/LayoutTests/inspector/timeline/timeline-load-event-expected.txt
@@ -2,32 +2,11 @@ Tests the load event.
 
 Page reloaded.
 Model records:
-MarkDOMContent Properties:
-{
-    data : {
-        isMainFrame : true
-    }
-    endTime : <number>
-    frameId : <string>
-    startTime : <number>
-    thread : <string>
-    type : "MarkDOMContent"
-}
-MarkLoad Properties:
-{
-    data : {
-        isMainFrame : true
-    }
-    endTime : <number>
-    frameId : <string>
-    startTime : <number>
-    thread : <string>
-    type : "MarkLoad"
-}
 Timestamp records:
 MarkDOMContent Properties:
 {
     data : {
+        frame : <string>
         isMainFrame : true
     }
     endTime : <number>
@@ -39,6 +18,7 @@ MarkDOMContent Properties:
 MarkLoad Properties:
 {
     data : {
+        frame : <string>
         isMainFrame : true
     }
     endTime : <number>