UserMetricsRecorder: Add missing break statement.

ash/metrics/user_metrics_recorder.cc

Index: ash/metrics/user_metrics_recorder.cc
diff --git a/ash/metrics/user_metrics_recorder.cc b/ash/metrics/user_metrics_recorder.cc
index a44cc788504cfea753c5127e212370c7635a2a63..2ab9380d9dbfcde573d7c13d435d8b0585d369f0 100644
--- a/ash/metrics/user_metrics_recorder.cc
+++ b/ash/metrics/user_metrics_recorder.cc
@@ -104,6 +104,7 @@ void UserMetricsRecorder::RecordUserMetricsAction(UserMetricsAction action) {
     case ash::UMA_SHELF_ALIGNMENT_SET_RIGHT:
       base::RecordAction(
           base::UserMetricsAction("Shelf_AlignmentSetRight"));
+      break;
     case ash::UMA_STATUS_AREA_AUDIO_CURRENT_INPUT_DEVICE:
       base::RecordAction(
           base::UserMetricsAction("StatusArea_Audio_CurrentInputDevice"));