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

components/cryptauth/mock_foreground_eid_generator.h

Index: components/cryptauth/mock_foreground_eid_generator.h
diff --git a/components/cryptauth/mock_foreground_eid_generator.h b/components/cryptauth/mock_foreground_eid_generator.h
index c9b328d041ed3f9f52ff586e490c987d7e488164..1b5932e06371f28d917ae4d5e3615718b3b14d65 100644
--- a/components/cryptauth/mock_foreground_eid_generator.h
+++ b/components/cryptauth/mock_foreground_eid_generator.h
@@ -30,7 +30,7 @@ class MockForegroundEidGenerator : public ForegroundEidGenerator {
     background_scan_filter_ = std::move(background_scan_filter);
   }
 
-  void set_advertisement(std::unique_ptr<DataWithTimestamp> advertisement) {
+  void set_advertisement(std::unique_ptr<EidDataWithTimestamp> advertisement) {
     advertisement_ = std::move(advertisement);
   }
 
@@ -47,7 +47,7 @@ class MockForegroundEidGenerator : public ForegroundEidGenerator {
   std::unique_ptr<EidData> GenerateBackgroundScanFilter(
       const std::vector<BeaconSeed>& scanning_device_beacon_seeds)
       const override;
-  std::unique_ptr<DataWithTimestamp> GenerateAdvertisement(
+  std::unique_ptr<EidDataWithTimestamp> GenerateAdvertisement(
       const std::string& advertising_device_public_key,
       const std::vector<BeaconSeed>& scanning_device_beacon_seeds)
       const override;
@@ -65,7 +65,7 @@ class MockForegroundEidGenerator : public ForegroundEidGenerator {
 
  private:
   std::unique_ptr<EidData> background_scan_filter_;
-  std::unique_ptr<DataWithTimestamp> advertisement_;
+  std::unique_ptr<EidDataWithTimestamp> advertisement_;
   std::unique_ptr<std::vector<std::string>> possible_advertisements_;
   const RemoteDevice* identified_device_;