[cleanup] Remove dead code

Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>

Author: pcdavid

packages/sirius-web/backend/sirius-web-application/src/main/java/org/eclipse/sirius/web/application/editingcontext/services/ResourceLoader.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2024, 2025 Obeo.
+ * Copyright (c) 2024, 2026 Obeo.
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
  * which accompanies this distribution, and is available at
@@ -12,10 +12,6 @@
  *******************************************************************************/
 package org.eclipse.sirius.web.application.editingcontext.services;
 
-import com.google.gson.Gson;
-import com.google.gson.JsonObject;
-import com.google.gson.JsonParser;
-
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
@@ -28,7 +24,6 @@
 import org.eclipse.sirius.components.emf.ResourceMetadataAdapter;
 import org.eclipse.sirius.components.emf.migration.MigrationService;
 import org.eclipse.sirius.components.emf.migration.api.IMigrationParticipant;
-import org.eclipse.sirius.components.emf.migration.api.MigrationData;
 import org.eclipse.sirius.components.emf.services.JSONResourceFactory;
 import org.eclipse.sirius.emfjson.resource.JsonResource;
 import org.eclipse.sirius.web.application.editingcontext.services.api.IResourceLoader;
@@ -78,10 +73,4 @@ public Optional<Resource> toResource(ResourceSet resourceSet, String id, String
 
         return optionalResource;
     }
-
-    public Optional<MigrationData> getMigrationDataFromDocumentContent(String content) {
-        JsonObject jsonObject = JsonParser.parseString(content).getAsJsonObject();
-        return Optional.ofNullable(jsonObject.getAsJsonObject(MigrationData.JSON_OBJECT_ROOT))
-                .map(migrationRootElement -> new Gson().fromJson(migrationRootElement, MigrationData.class)).stream().findFirst();
-    }
 }