Reduce usage of FOR_EACH_OBSERVER macro in components/

components/proximity_auth/proximity_monitor_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/proximity_monitor_impl.h"
 
 #include <math.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 203 matching lines @@
                     << connection_info.transmit_power << " "
                     << connection_info.max_transmit_power;
     rssi_rolling_average_.reset();
     last_transmit_power_reading_.reset();
     CheckForProximityStateChange();
   }
 }
 
 void ProximityMonitorImpl::ClearProximityState() {
   if (is_active_ && remote_device_is_in_proximity_) {
-    FOR_EACH_OBSERVER(ProximityMonitorObserver, observers_,
-                      OnProximityStateChanged());
+    for (auto& observer : observers_)
+      observer.OnProximityStateChanged();
   }
 
   remote_device_is_in_proximity_ = false;
   rssi_rolling_average_.reset();
   last_transmit_power_reading_.reset();
   last_zero_rssi_timestamp_.reset();
 }
 
 void ProximityMonitorImpl::AddSample(
     const BluetoothDevice::ConnectionInfo& connection_info) {
@@ skipping 30 matching lines @@
     case Strategy::CHECK_TRANSMIT_POWER:
       is_now_in_proximity = (last_transmit_power_reading_ &&
                              last_transmit_power_reading_->IsInProximity());
       break;
   }
 
   if (remote_device_is_in_proximity_ != is_now_in_proximity) {
     PA_LOG(INFO) << "[Proximity] Updated proximity state: "
                  << (is_now_in_proximity ? "proximate" : "distant");
     remote_device_is_in_proximity_ = is_now_in_proximity;
-    FOR_EACH_OBSERVER(ProximityMonitorObserver, observers_,
-                      OnProximityStateChanged());
+    for (auto& observer : observers_)
+      observer.OnProximityStateChanged();
   }
 }
 
 }  // namespace proximity_auth