Remove usage of FOR_EACH_OBSERVER macro in components/

components/data_usage/core/data_use_aggregator.cc

Index: components/data_usage/core/data_use_aggregator.cc
diff --git a/components/data_usage/core/data_use_aggregator.cc b/components/data_usage/core/data_use_aggregator.cc
index 7317af10f562a2ffa2c3073952906103c7da830b..8efb20b1f212ef3c0337e690b8cf3ef73db5c5fb 100644
--- a/components/data_usage/core/data_use_aggregator.cc
+++ b/components/data_usage/core/data_use_aggregator.cc
@@ -128,7 +128,8 @@ void DataUseAggregator::PassDataUseToAmortizer(
 void DataUseAggregator::OnAmortizationComplete(
     std::unique_ptr<DataUse> amortized_data_use) {
   DCHECK(thread_checker_.CalledOnValidThread());
-  FOR_EACH_OBSERVER(Observer, observer_list_, OnDataUse(*amortized_data_use));
+  for (Observer& observer : observer_list_)
+    observer.OnDataUse(*amortized_data_use);
 }
 
 }  // namespace data_usage