Revert of Change Numeric sourceInfos into sample diagnostics

tracing/tracing/metrics/system_health/first_paint_metric.html

Index: tracing/tracing/metrics/system_health/first_paint_metric.html
diff --git a/tracing/tracing/metrics/system_health/first_paint_metric.html b/tracing/tracing/metrics/system_health/first_paint_metric.html
index 31eed384bbbe6a2f6bc4ead3098a3402244851a1..f2edb908f076cba6d567a5188e286dcdbde51199 100644
--- a/tracing/tracing/metrics/system_health/first_paint_metric.html
+++ b/tracing/tracing/metrics/system_health/first_paint_metric.html
@@ -284,7 +284,7 @@
           return;
 
         var timeToEvent = ev.start - navigationStartEvent.start;
-        histogram.add(timeToEvent, new tr.v.d.Generic({url: url}));
+        histogram.add(timeToEvent, {url: url});
       }, this);
       values.addValue(new tr.v.NumericValue(
           metric.valueName, histogram,
@@ -362,8 +362,7 @@
         return;
       }
       var timeToFirstMeaningfulPaint = paintEvent.start - navigationStart.start;
-      firstMeaningfulPaintHistogram.add(timeToFirstMeaningfulPaint,
-          new tr.v.d.Generic({url: url}));
+      firstMeaningfulPaintHistogram.add(timeToFirstMeaningfulPaint, {url: url});
     }
 
     var layoutsForFrameId = findAllLayoutEvents(rendererHelper);