Remove usage of FOR_EACH_OBSERVER macro in device/

device/bluetooth/dbus/fake_bluetooth_adapter_client.cc

Index: device/bluetooth/dbus/fake_bluetooth_adapter_client.cc
diff --git a/device/bluetooth/dbus/fake_bluetooth_adapter_client.cc b/device/bluetooth/dbus/fake_bluetooth_adapter_client.cc
index cc8ce7d382534f45974783c2d44f1c00e09a7829..8d4478c45543eeb5bd15670ce84073c6292b49d4 100644
--- a/device/bluetooth/dbus/fake_bluetooth_adapter_client.cc
+++ b/device/bluetooth/dbus/fake_bluetooth_adapter_client.cc
@@ -274,15 +274,15 @@ void FakeBluetoothAdapterClient::SetVisible(bool visible) {
     // Adapter becoming visible
     visible_ = visible;
 
-    FOR_EACH_OBSERVER(BluetoothAdapterClient::Observer, observers_,
-                      AdapterAdded(dbus::ObjectPath(kAdapterPath)));
+    for (auto& observer : observers_)
+      observer.AdapterAdded(dbus::ObjectPath(kAdapterPath));
 
   } else if (visible_ && !visible) {
     // Adapter becoming invisible
     visible_ = visible;
 
-    FOR_EACH_OBSERVER(BluetoothAdapterClient::Observer, observers_,
-                      AdapterRemoved(dbus::ObjectPath(kAdapterPath)));
+    for (auto& observer : observers_)
+      observer.AdapterRemoved(dbus::ObjectPath(kAdapterPath));
   }
 }
 
@@ -291,15 +291,15 @@ void FakeBluetoothAdapterClient::SetSecondVisible(bool visible) {
     // Second adapter becoming visible
     second_visible_ = visible;
 
-    FOR_EACH_OBSERVER(BluetoothAdapterClient::Observer, observers_,
-                      AdapterAdded(dbus::ObjectPath(kSecondAdapterPath)));
+    for (auto& observer : observers_)
+      observer.AdapterAdded(dbus::ObjectPath(kSecondAdapterPath));
 
   } else if (second_visible_ && !visible) {
     // Second adapter becoming invisible
     second_visible_ = visible;
 
-    FOR_EACH_OBSERVER(BluetoothAdapterClient::Observer, observers_,
-                      AdapterRemoved(dbus::ObjectPath(kSecondAdapterPath)));
+    for (auto& observer : observers_)
+      observer.AdapterRemoved(dbus::ObjectPath(kSecondAdapterPath));
   }
 }
 
@@ -329,9 +329,10 @@ void FakeBluetoothAdapterClient::OnPropertyChanged(
     }
   }
 
-  FOR_EACH_OBSERVER(
-      BluetoothAdapterClient::Observer, observers_,
-      AdapterPropertyChanged(dbus::ObjectPath(kAdapterPath), property_name));
+  for (auto& observer : observers_) {
+    observer.AdapterPropertyChanged(dbus::ObjectPath(kAdapterPath),
+                                    property_name);
+  }
 }
 
 void FakeBluetoothAdapterClient::PostDelayedTask(