[EasyUnlock] Move DataWithTimestamp out of ForegroundEidGenerator so it can be shared.

chromeos/components/tether/ble_advertiser.h

Index: chromeos/components/tether/ble_advertiser.h
diff --git a/chromeos/components/tether/ble_advertiser.h b/chromeos/components/tether/ble_advertiser.h
index fcc10f56b5d12d7ed69ab3eb504f3c4c3bf272e2..c7c25f7e0e33d9f6500f9a8b5ebe78102547dad5 100644
--- a/chromeos/components/tether/ble_advertiser.h
+++ b/chromeos/components/tether/ble_advertiser.h
@@ -70,8 +70,7 @@ class BleAdvertiser {
    public:
     IndividualAdvertisement(
         scoped_refptr<device::BluetoothAdapter> adapter,
-        std::unique_ptr<cryptauth::ForegroundEidGenerator::DataWithTimestamp>
-            advertisement_data,
+        std::unique_ptr<cryptauth::DataWithTimestamp> advertisement_data,
         std::shared_ptr<BleAdvertisementUnregisterHandler> unregister_handler);
 
     // device::BluetoothAdapter::Observer
@@ -104,8 +103,7 @@ class BleAdvertiser {
 
     scoped_refptr<device::BluetoothAdapter> adapter_;
     bool is_initializing_advertising_;
-    std::unique_ptr<cryptauth::ForegroundEidGenerator::DataWithTimestamp>
-        advertisement_data_;
+    std::unique_ptr<cryptauth::DataWithTimestamp> advertisement_data_;
     std::shared_ptr<BleAdvertisementUnregisterHandler> unregister_handler_;
     scoped_refptr<device::BluetoothAdvertisement> advertisement_;