Use stricter type checking in UMA_HISTOGRAM_ENUMERATION

chrome/browser/policy/cloud/cloud_policy_invalidator.h

Index: chrome/browser/policy/cloud/cloud_policy_invalidator.h
diff --git a/chrome/browser/policy/cloud/cloud_policy_invalidator.h b/chrome/browser/policy/cloud/cloud_policy_invalidator.h
index a2e3be8ec5ce3bbc28a4c44103a4b422d502def3..76db79a34843d9515084693a92797f516a721c6b 100644
--- a/chrome/browser/policy/cloud/cloud_policy_invalidator.h
+++ b/chrome/browser/policy/cloud/cloud_policy_invalidator.h
@@ -21,6 +21,7 @@
 #include "components/invalidation/public/invalidation_handler.h"
 #include "components/policy/core/common/cloud/cloud_policy_core.h"
 #include "components/policy/core/common/cloud/cloud_policy_store.h"
+#include "components/policy/core/common/cloud/enterprise_metrics.h"
 #include "components/policy/proto/device_management_backend.pb.h"
 #include "google/cacheinvalidation/include/types.h"
 
@@ -156,11 +157,12 @@ class CloudPolicyInvalidator : public syncer::InvalidationHandler,
 
   // Get the kMetricPolicyRefresh histogram metric which should be incremented
   // when a policy is stored.
-  int GetPolicyRefreshMetric(bool policy_changed);
+  MetricPolicyRefresh GetPolicyRefreshMetric(bool policy_changed);
 
   // Get the kMetricPolicyInvalidations histogram metric which should be
   // incremented when an invalidation is received.
-  int GetInvalidationMetric(bool is_missing_payload, bool is_expired);
+  PolicyInvalidationType GetInvalidationMetric(bool is_missing_payload,
+                                               bool is_expired);
 
   // Determine if invalidations have been enabled longer than the grace period.
   bool GetInvalidationsEnabled();