Reduce usage of FOR_EACH_OBSERVER macro in components/

components/proximity_auth/remote_device_life_cycle_impl.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/proximity_auth/remote_device_life_cycle_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 89 matching lines @@
       connection_.get(), remote_device_.user_id,
       proximity_auth_client_->CreateSecureMessageDelegate());
 }
 
 void RemoteDeviceLifeCycleImpl::TransitionToState(
     RemoteDeviceLifeCycle::State new_state) {
   PA_LOG(INFO) << "Life cycle transition: " << static_cast<int>(state_)
                << " => " << static_cast<int>(new_state);
   RemoteDeviceLifeCycle::State old_state = state_;
   state_ = new_state;
-  FOR_EACH_OBSERVER(Observer, observers_,
-                    OnLifeCycleStateChanged(old_state, new_state));
+  for (auto& observer : observers_)
+    observer.OnLifeCycleStateChanged(old_state, new_state);
 }
 
 void RemoteDeviceLifeCycleImpl::FindConnection() {
   connection_finder_ = CreateConnectionFinder();
   connection_finder_->Find(
       base::Bind(&RemoteDeviceLifeCycleImpl::OnConnectionFound,
                  weak_ptr_factory_.GetWeakPtr()));
   TransitionToState(RemoteDeviceLifeCycle::State::FINDING_CONNECTION);
 }
 
@@ skipping 44 matching lines @@
   TransitionToState(RemoteDeviceLifeCycle::State::SECURE_CHANNEL_ESTABLISHED);
 }
 
 void RemoteDeviceLifeCycleImpl::OnDisconnected() {
   DCHECK(state_ == RemoteDeviceLifeCycle::State::SECURE_CHANNEL_ESTABLISHED);
   messenger_.reset();
   FindConnection();
 }
 
 }  // namespace proximity_auth