Reduce FOR_EACH_OBSERVER usage in extensions

extensions/browser/script_executor.cc

Index: extensions/browser/script_executor.cc
diff --git a/extensions/browser/script_executor.cc b/extensions/browser/script_executor.cc
index 105889c3121ab97e6a23ad4c9d5f370df28808ad..db2c02da3031784a258f5e4abb7ac972cee8d177 100644
--- a/extensions/browser/script_executor.cc
+++ b/extensions/browser/script_executor.cc
@@ -168,9 +168,8 @@ class Handler : public content::WebContentsObserver {
         host_id_.type() == HostID::EXTENSIONS) {
       ScriptExecutionObserver::ExecutingScriptsMap id_map;
       id_map[host_id_.id()] = std::set<std::string>();
-      FOR_EACH_OBSERVER(
-          ScriptExecutionObserver, *script_observers_,
-          OnScriptsExecuted(web_contents(), id_map, root_frame_url_));
+      for (auto& observer : *script_observers_)
+        observer.OnScriptsExecuted(web_contents(), id_map, root_frame_url_);
     }
 
     if (!callback_.is_null())