Update PageLoadTiming to use base::Optional

components/page_load_metrics/browser/page_load_metrics_util.h

Index: components/page_load_metrics/browser/page_load_metrics_util.h
diff --git a/components/page_load_metrics/browser/page_load_metrics_util.h b/components/page_load_metrics/browser/page_load_metrics_util.h
index 66dc3aa7119f2cfc5dbba22b6032092d94ce1a78..dfeeabdb14693c1890c307db89b874bb2813f4e1 100644
--- a/components/page_load_metrics/browser/page_load_metrics_util.h
+++ b/components/page_load_metrics/browser/page_load_metrics_util.h
@@ -29,9 +29,6 @@ struct PageLoadTiming;
 // If the event time delta and background time delta are equal, we still
 // consider the event to be logged in the foreground histogram since any
 // background specific handling would not yet have been applied to that event.
-bool WasStartedInForegroundEventInForeground(base::TimeDelta event,
-                                             const PageLoadExtraInfo& info);
-
 bool WasStartedInForegroundOptionalEventInForeground(
     const base::Optional<base::TimeDelta>& event,
     const PageLoadExtraInfo& info);
@@ -40,8 +37,8 @@ bool WasStartedInForegroundOptionalEventInForeground(
 // - Parse started and did not complete but the entire page load duration
 // happened in the foreground.
 // - Parse completed and happened entirely in the foreground.
-bool WasParseInForeground(base::TimeDelta parse_start,
-                          base::TimeDelta parse_stop,
+bool WasParseInForeground(const base::Optional<base::TimeDelta>& parse_start,
+                          const base::Optional<base::TimeDelta>& parse_stop,
                           const PageLoadExtraInfo& info);
 }  // namespace page_load_metrics