Use stricter type checking in UMA_HISTOGRAM_ENUMERATION

components/sync/driver/data_type_manager_impl.cc

Index: components/sync/driver/data_type_manager_impl.cc
diff --git a/components/sync/driver/data_type_manager_impl.cc b/components/sync/driver/data_type_manager_impl.cc
index 07a376c25c97e4f536e5e59279f736b2569c90fa..81cbb05e4a4b06b381e1b1894cc65824dd80b7e4 100644
--- a/components/sync/driver/data_type_manager_impl.cc
+++ b/components/sync/driver/data_type_manager_impl.cc
@@ -253,9 +253,10 @@ void DataTypeManagerImpl::Restart(ConfigureReason reason) {
       reason == CONFIGURE_REASON_NEWLY_ENABLED_DATA_TYPE) {
     for (ModelTypeSet::Iterator iter = last_requested_types_.First();
          iter.Good(); iter.Inc()) {
+      // TODO(wychen): enum uma should be strongly typed. crbug.com/661401
       UMA_HISTOGRAM_ENUMERATION("Sync.ConfigureDataTypes",
                                 ModelTypeToHistogramInt(iter.Get()),
-                                MODEL_TYPE_COUNT);
+                                static_cast<int>(MODEL_TYPE_COUNT));
     }
   }