Remove usage of FOR_EACH_OBSERVER macro in components/policy

components/policy/core/common/configuration_policy_provider.cc

Index: components/policy/core/common/configuration_policy_provider.cc
diff --git a/components/policy/core/common/configuration_policy_provider.cc b/components/policy/core/common/configuration_policy_provider.cc
index 17ff41870004c330b7d03804041ccf3e7bdab05d..fd3beec280d7a3c300ed0fd996114f3185b795b1 100644
--- a/components/policy/core/common/configuration_policy_provider.cc
+++ b/components/policy/core/common/configuration_policy_provider.cc
@@ -47,9 +47,8 @@ void ConfigurationPolicyProvider::UpdatePolicy(
     policy_bundle_.Swap(bundle.get());
   else
     policy_bundle_.Clear();
-  FOR_EACH_OBSERVER(ConfigurationPolicyProvider::Observer,
-                    observer_list_,
-                    OnUpdatePolicy(this));
+  for (auto& observer : observer_list_)
+    observer.OnUpdatePolicy(this);
 }
 
 SchemaRegistry* ConfigurationPolicyProvider::schema_registry() const {