Split a MetricsLogStore object out of MetricsLogManager.

components/ukm/persisted_logs_metrics_impl.cc

Index: components/ukm/persisted_logs_metrics_impl.cc
diff --git a/components/ukm/persisted_logs_metrics_impl.cc b/components/ukm/persisted_logs_metrics_impl.cc
index 7534854c0717df043f13544a38a12f05d1700e36..fa5fa9701bfb5753b1a668d20112ea8982f7a830 100644
--- a/components/ukm/persisted_logs_metrics_impl.cc
+++ b/components/ukm/persisted_logs_metrics_impl.cc
@@ -12,12 +12,10 @@ PersistedLogsMetricsImpl::PersistedLogsMetricsImpl() = default;
 
 PersistedLogsMetricsImpl::~PersistedLogsMetricsImpl() = default;
 
-metrics::PersistedLogs::LogReadStatus
-PersistedLogsMetricsImpl::RecordLogReadStatus(
-    metrics::PersistedLogs::LogReadStatus status) {
+void PersistedLogsMetricsImpl::RecordLogReadStatus(
+    metrics::PersistedLogsMetrics::LogReadStatus status) {
   UMA_HISTOGRAM_ENUMERATION("UKM.PersistentLogRecall.Status", status,
-                            metrics::PersistedLogs::END_RECALL_STATUS);
-  return status;
+                            metrics::PersistedLogsMetrics::END_RECALL_STATUS);
 }
 
 void PersistedLogsMetricsImpl::RecordCompressionRatio(size_t compressed_size,