Use stricter type checking in UMA_HISTOGRAM_ENUMERATION

components/password_manager/core/browser/password_syncable_service.cc

Index: components/password_manager/core/browser/password_syncable_service.cc
diff --git a/components/password_manager/core/browser/password_syncable_service.cc b/components/password_manager/core/browser/password_syncable_service.cc
index 75d20b2aeb5c91aacc9f1317575af85918021162..94379683e01774e213c06a8a7e6e1278bc53e7cd 100644
--- a/components/password_manager/core/browser/password_syncable_service.cc
+++ b/components/password_manager/core/browser/password_syncable_service.cc
@@ -301,9 +301,10 @@ bool PasswordSyncableService::ReadFromPasswordStore(
       !password_store_->FillBlacklistLogins(&blacklist_entries)) {
     // Password store often fails to load passwords. Track failures with UMA.
     // (http://crbug.com/249000)
+    // TODO(wychen): enum uma should be strongly typed. crbug.com/661401
     UMA_HISTOGRAM_ENUMERATION("Sync.LocalDataFailedToLoad",
                               ModelTypeToHistogramInt(syncer::PASSWORDS),
-                              syncer::MODEL_TYPE_COUNT);
+                              static_cast<int>(syncer::MODEL_TYPE_COUNT));
     return false;
   }
   password_entries->resize(autofillable_entries.size() +