Add RemoteDeviceLoader to create RemoteDevice from CryptAuth data.

components/proximity_auth/proximity_auth_system_unittest.cc

Index: components/proximity_auth/proximity_auth_system_unittest.cc
diff --git a/components/proximity_auth/proximity_auth_system_unittest.cc b/components/proximity_auth/proximity_auth_system_unittest.cc
index 45d17dbf7d690d12418d138926911cde5156500e..e89bb10421e4c6279957c511c07a8e7f3c0790ed 100644
--- a/components/proximity_auth/proximity_auth_system_unittest.cc
+++ b/components/proximity_auth/proximity_auth_system_unittest.cc
@@ -9,8 +9,10 @@
 namespace proximity_auth {
 
 TEST(ProximityAuthSystemTest, GetRemoteDevices) {
-  RemoteDevice device1("device1", "public_key1", "bt_addr1", "psk1");
-  RemoteDevice device2("device2", "public_key2", "bt_addr2", "psk2");
+  RemoteDevice device1("example@gmail.com", "device1", "public_key1",
+                       "bt_addr1", "psk1");
+  RemoteDevice device2("example@gmail.com", "device2", "public_key2",
+                       "bt_addr2", "psk2");
 
   std::vector<RemoteDevice> device_list;
   device_list.push_back(device1);