Make update over cellular an option for user

chromeos/dbus/fake_update_engine_client.h

Index: chromeos/dbus/fake_update_engine_client.h
diff --git a/chromeos/dbus/fake_update_engine_client.h b/chromeos/dbus/fake_update_engine_client.h
index 2d9db4cca6bf529c710ba02be557714c4bd01519..e23c2b3426202ac6b8b11d51d19b1be192f7e719 100644
--- a/chromeos/dbus/fake_update_engine_client.h
+++ b/chromeos/dbus/fake_update_engine_client.h
@@ -38,7 +38,10 @@ class FakeUpdateEngineClient : public UpdateEngineClient {
   void GetEolStatus(const GetEolStatusCallback& callback) override;
   void SetUpdateOverCellularPermission(bool allowed,
                                        const base::Closure& callback) override;
-
+  void SetUpdateOverCellularTarget(
+      const std::string& target_version,
+      int64_t target_size,
+      const SetUpdateOverCellularTargetCallback& callback) override;
   // Pushes UpdateEngineClient::Status in the queue to test changing status.
   // GetLastStatus() returns the status set by this method in FIFO order.
   // See set_default_status().