[EasyUnlock] Update ProximityMonitor to only check for RSSI proximity.

components/proximity_auth/unlock_manager_impl.h

Index: components/proximity_auth/unlock_manager_impl.h
diff --git a/components/proximity_auth/unlock_manager_impl.h b/components/proximity_auth/unlock_manager_impl.h
index 3e1c03c11c011053e349a235298d6b16b18a1338..104f01b8a8f0f76b18bcef10a3ab9c4f8cb50a60 100644
--- a/components/proximity_auth/unlock_manager_impl.h
+++ b/components/proximity_auth/unlock_manager_impl.h
@@ -52,10 +52,10 @@ class UnlockManagerImpl : public UnlockManager,
       ScreenlockBridge::LockHandler::AuthType auth_type) override;
 
  protected:
-  // Creates a ProximityMonitor instance for the given |remote_device|.
+  // Creates a ProximityMonitor instance for the given |connection|.
   // Exposed for testing.
   virtual std::unique_ptr<ProximityMonitor> CreateProximityMonitor(
-      const cryptauth::RemoteDevice& remote_device);
+      cryptauth::Connection* connection);
 
  private:
   // The possible lock screen states for the remote device.