Reduce FOR_EACH_OBSERVER usage in ui/

ui/display/chromeos/display_configurator.cc

Index: ui/display/chromeos/display_configurator.cc
diff --git a/ui/display/chromeos/display_configurator.cc b/ui/display/chromeos/display_configurator.cc
index b0bd0a08835208a066dc4f491a94676667bf8581..133b250b13c50e7fe651ac9e7a89d38eb4d54ff6 100644
--- a/ui/display/chromeos/display_configurator.cc
+++ b/ui/display/chromeos/display_configurator.cc
@@ -1109,18 +1109,17 @@ void DisplayConfigurator::NotifyDisplayStateObservers(
     bool success,
     MultipleDisplayState attempted_state) {
   if (success) {
-    FOR_EACH_OBSERVER(
-        Observer, observers_, OnDisplayModeChanged(cached_displays_));
+    for (auto& observer : observers_)
+      observer.OnDisplayModeChanged(cached_displays_);
   } else {
-    FOR_EACH_OBSERVER(
-        Observer, observers_, OnDisplayModeChangeFailed(cached_displays_,
-                                                        attempted_state));
+    for (auto& observer : observers_)
+      observer.OnDisplayModeChangeFailed(cached_displays_, attempted_state);
   }
 }
 
 void DisplayConfigurator::NotifyPowerStateObservers() {
-  FOR_EACH_OBSERVER(
-      Observer, observers_, OnPowerStateChanged(current_power_state_));
+  for (auto& observer : observers_)
+    observer.OnPowerStateChanged(current_power_state_);
 }
 
 int64_t DisplayConfigurator::AddVirtualDisplay(const gfx::Size& display_size) {