Remove usage of FOR_EACH_OBSERVER macro in device/

device/hid/input_service_linux.cc

Index: device/hid/input_service_linux.cc
diff --git a/device/hid/input_service_linux.cc b/device/hid/input_service_linux.cc
index 75eb3526a252ac2e0a66bfdf3efde505a5bf0a8e..b9a1ac040899bd33adcd0719ff3c5c83c95788c3 100644
--- a/device/hid/input_service_linux.cc
+++ b/device/hid/input_service_linux.cc
@@ -241,12 +241,14 @@ bool InputServiceLinux::GetDeviceInfo(const std::string& id,
 
 void InputServiceLinux::AddDevice(const InputDeviceInfo& info) {
   devices_[info.id] = info;
-  FOR_EACH_OBSERVER(Observer, observers_, OnInputDeviceAdded(info));
+  for (auto& observer : observers_)
+    observer.OnInputDeviceAdded(info);
 }
 
 void InputServiceLinux::RemoveDevice(const std::string& id) {
   devices_.erase(id);
-  FOR_EACH_OBSERVER(Observer, observers_, OnInputDeviceRemoved(id));
+  for (auto& observer : observers_)
+    observer.OnInputDeviceRemoved(id);
 }
 
 bool InputServiceLinux::CalledOnValidThread() const {