[UMA, Cleanup] Remove an unneeded timing-related histogram.

chrome/browser/chromeos/external_metrics.cc

Index: chrome/browser/chromeos/external_metrics.cc
diff --git a/chrome/browser/chromeos/external_metrics.cc b/chrome/browser/chromeos/external_metrics.cc
index 432fa5a7008e0b8bb251dcb410ceaa90176301c7..e36f17ac1d82bfadf148f5360cbeb05683458605 100644
--- a/chrome/browser/chromeos/external_metrics.cc
+++ b/chrome/browser/chromeos/external_metrics.cc
@@ -11,7 +11,6 @@
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/metrics/statistics_recorder.h"
-#include "base/timer/elapsed_timer.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/metrics/chromeos_metrics_provider.h"
 #include "components/metrics/metrics_service.h"
@@ -165,9 +164,7 @@ int ExternalMetrics::CollectEvents() {
 }
 
 void ExternalMetrics::CollectEventsAndReschedule() {
-  base::ElapsedTimer timer;
   CollectEvents();
-  UMA_HISTOGRAM_TIMES("UMA.CollectExternalEventsTime", timer.Elapsed());
   ScheduleCollector();
 }