[CrOS Tether] Add a static TruncateDeviceIdForLogs() function.

components/cryptauth/remote_device.h

Index: components/cryptauth/remote_device.h
diff --git a/components/cryptauth/remote_device.h b/components/cryptauth/remote_device.h
index 5539055bfbde4255790c2e0d4ab44c7c5d7bc9f8..79411ac83a73c2f6c7a795026bd77be812108547 100644
--- a/components/cryptauth/remote_device.h
+++ b/components/cryptauth/remote_device.h
@@ -42,6 +42,9 @@ struct RemoteDevice {
   std::string GetTruncatedDeviceIdForLogs() const;
 
   bool operator==(const RemoteDevice& other) const;
+
+  // Static method for truncated device ID for logs.
+  static std::string TruncateDeviceIdForLogs(const std::string& full_id);
 };
 
 typedef std::vector<RemoteDevice> RemoteDeviceList;