Remove usage of FOR_EACH_OBSERVER macro in components/policy

components/policy/core/common/cloud/cloud_policy_store.cc

Index: components/policy/core/common/cloud/cloud_policy_store.cc
diff --git a/components/policy/core/common/cloud/cloud_policy_store.cc b/components/policy/core/common/cloud/cloud_policy_store.cc
index 2544536f5aa5bd27a92f5286e4c6c56f6618d138..005161f6e127b0f767081589450146e2f38f95e1 100644
--- a/components/policy/core/common/cloud/cloud_policy_store.cc
+++ b/components/policy/core/common/cloud/cloud_policy_store.cc
@@ -44,12 +44,14 @@ void CloudPolicyStore::NotifyStoreLoaded() {
   // metadata already.
   if (external_data_manager_)
     external_data_manager_->OnPolicyStoreLoaded();
-  FOR_EACH_OBSERVER(Observer, observers_, OnStoreLoaded(this));
+  for (auto& observer : observers_)
+    observer.OnStoreLoaded(this);
 }
 
 void CloudPolicyStore::NotifyStoreError() {
   is_initialized_ = true;
-  FOR_EACH_OBSERVER(Observer, observers_, OnStoreError(this));
+  for (auto& observer : observers_)
+    observer.OnStoreError(this);
 }
 
 void CloudPolicyStore::SetExternalDataManager(