Add RemoteDeviceLoader to create RemoteDevice from CryptAuth data.

components/proximity_auth/bluetooth_connection_unittest.cc

Index: components/proximity_auth/bluetooth_connection_unittest.cc
diff --git a/components/proximity_auth/bluetooth_connection_unittest.cc b/components/proximity_auth/bluetooth_connection_unittest.cc
index fb007bab26131ff091b8597c252211ada18dfb0a..c298a8fe0dd8649334ae43885579e1df2493d7b3 100644
--- a/components/proximity_auth/bluetooth_connection_unittest.cc
+++ b/components/proximity_auth/bluetooth_connection_unittest.cc
@@ -29,6 +29,7 @@ using testing::StrictMock;
 namespace proximity_auth {
 namespace {
 
+const char kDeviceUserId[] = "example@gmail.com";
 const char kDeviceName[] = "Device name";
 const char kOtherDeviceName[] = "Other device name";
 
@@ -77,8 +78,8 @@ class MockBluetoothConnection : public BluetoothConnection {
 
  private:
   RemoteDevice CreateRemoteDevice() {
-    return RemoteDevice(kDeviceName, kPublicKey, kBluetoothAddress,
-                        kPersistentSymmetricKey);
+    return RemoteDevice(kDeviceUserId, kDeviceName, kPublicKey,
+                        kBluetoothAddress, kPersistentSymmetricKey);
   }
 
   DISALLOW_COPY_AND_ASSIGN(MockBluetoothConnection);