Replace FOR_EACH_OBSERVER in chromeos/ with range-based for

chromeos/dbus/fake_power_manager_client.cc

Index: chromeos/dbus/fake_power_manager_client.cc
diff --git a/chromeos/dbus/fake_power_manager_client.cc b/chromeos/dbus/fake_power_manager_client.cc
index dcb82fac20dd48af9a34d86a0bdd10d2a857279a..423083ad0926b571702769c34e66485ae2560e85 100644
--- a/chromeos/dbus/fake_power_manager_client.cc
+++ b/chromeos/dbus/fake_power_manager_client.cc
@@ -153,7 +153,8 @@ bool FakePowerManagerClient::PopVideoActivityReport() {
 }
 
 void FakePowerManagerClient::SendSuspendImminent() {
-  FOR_EACH_OBSERVER(Observer, observers_, SuspendImminent());
+  for (auto& observer : observers_)
+    observer.SuspendImminent();
   if (render_process_manager_delegate_)
     render_process_manager_delegate_->SuspendImminent();
 }
@@ -162,18 +163,20 @@ void FakePowerManagerClient::SendSuspendDone() {
   if (render_process_manager_delegate_)
     render_process_manager_delegate_->SuspendDone();
 
-  FOR_EACH_OBSERVER(Observer, observers_, SuspendDone(base::TimeDelta()));
+  for (auto& observer : observers_)
+    observer.SuspendDone(base::TimeDelta());
 }
 
 void FakePowerManagerClient::SendDarkSuspendImminent() {
-  FOR_EACH_OBSERVER(Observer, observers_, DarkSuspendImminent());
+  for (auto& observer : observers_)
+    observer.DarkSuspendImminent();
 }
 
 void FakePowerManagerClient::SendPowerButtonEvent(
     bool down,
     const base::TimeTicks& timestamp) {
-  FOR_EACH_OBSERVER(Observer, observers_,
-                    PowerButtonEventReceived(down, timestamp));
+  for (auto& observer : observers_)
+    observer.PowerButtonEventReceived(down, timestamp);
 }
 
 void FakePowerManagerClient::UpdatePowerProperties(
@@ -183,7 +186,8 @@ void FakePowerManagerClient::UpdatePowerProperties(
 }
 
 void FakePowerManagerClient::NotifyObservers() {
-  FOR_EACH_OBSERVER(Observer, observers_, PowerChanged(props_));
+  for (auto& observer : observers_)
+    observer.PowerChanged(props_);
 }
 
 void FakePowerManagerClient::HandleSuspendReadiness() {