Remove usage of FOR_EACH_OBSERVER macro in apps/

apps/app_lifetime_monitor.cc

Index: apps/app_lifetime_monitor.cc
diff --git a/apps/app_lifetime_monitor.cc b/apps/app_lifetime_monitor.cc
index 6051f0c1c222f58e87d483d1af11f8667dbf4268..637c90916cdbbdbdb07d8056234d4b030913528d 100644
--- a/apps/app_lifetime_monitor.cc
+++ b/apps/app_lifetime_monitor.cc
@@ -125,23 +125,28 @@ bool AppLifetimeMonitor::HasOtherVisibleAppWindows(
 }
 
 void AppLifetimeMonitor::NotifyAppStart(const std::string& app_id) {
-  FOR_EACH_OBSERVER(Observer, observers_, OnAppStart(profile_, app_id));
+  for (auto& observer : observers_)
+    observer.OnAppStart(profile_, app_id);
 }
 
 void AppLifetimeMonitor::NotifyAppActivated(const std::string& app_id) {
-  FOR_EACH_OBSERVER(Observer, observers_, OnAppActivated(profile_, app_id));
+  for (auto& observer : observers_)
+    observer.OnAppActivated(profile_, app_id);
 }
 
 void AppLifetimeMonitor::NotifyAppDeactivated(const std::string& app_id) {
-  FOR_EACH_OBSERVER(Observer, observers_, OnAppDeactivated(profile_, app_id));
+  for (auto& observer : observers_)
+    observer.OnAppDeactivated(profile_, app_id);
 }
 
 void AppLifetimeMonitor::NotifyAppStop(const std::string& app_id) {
-  FOR_EACH_OBSERVER(Observer, observers_, OnAppStop(profile_, app_id));
+  for (auto& observer : observers_)
+    observer.OnAppStop(profile_, app_id);
 }
 
 void AppLifetimeMonitor::NotifyChromeTerminating() {
-  FOR_EACH_OBSERVER(Observer, observers_, OnChromeTerminating());
+  for (auto& observer : observers_)
+    observer.OnChromeTerminating();
 }
 
 }  // namespace apps