Remove FOR_EACH_OBSERVER macro usage in chrome/browser/sync_file_system

chrome/browser/sync_file_system/task_logger.cc

Index: chrome/browser/sync_file_system/task_logger.cc
diff --git a/chrome/browser/sync_file_system/task_logger.cc b/chrome/browser/sync_file_system/task_logger.cc
index dfe7753a94bdff5b5f528851e84e35d9688dec52..661c35958c3c729062e86deec4e6486ec50d2cee 100644
--- a/chrome/browser/sync_file_system/task_logger.cc
+++ b/chrome/browser/sync_file_system/task_logger.cc
@@ -46,8 +46,8 @@ void TaskLogger::RecordLog(std::unique_ptr<TaskLog> log) {
 
   log_history_.push_back(std::move(log));
 
-  FOR_EACH_OBSERVER(Observer, observers_,
-                    OnLogRecorded(*log_history_.back()));
+  for (auto& observer : observers_)
+    observer.OnLogRecorded(*log_history_.back());
 }
 
 void TaskLogger::ClearLog() {