Remove ScopedVector in //component/metrics

components/metrics/daily_event.h

Index: components/metrics/daily_event.h
diff --git a/components/metrics/daily_event.h b/components/metrics/daily_event.h
index 18591a7036e9a9ee56117e1c0fb98fac41a91087..4f283011f13672d8b239be35db6f53699383f362 100644
--- a/components/metrics/daily_event.h
+++ b/components/metrics/daily_event.h
@@ -6,9 +6,9 @@
 #define COMPONENTS_METRICS_DAILY_EVENT_H_
 
 #include <memory>
+#include <vector>
 
 #include "base/macros.h"
-#include "base/memory/scoped_vector.h"
 #include "base/time/time.h"
 
 class PrefRegistrySimple;
@@ -80,7 +80,7 @@ class DailyEvent {
   std::string histogram_name_;
 
   // A list of observers.
-  ScopedVector<Observer> observers_;
+  std::vector<std::unique_ptr<Observer>> observers_;
 
   // The time that the daily event was last fired.
   base::Time last_fired_;