[2021.1 compat] Remove call to not needed `Extensions.registerAreaClass`
API was removed in [this commit](https://github.com/JetBrains/intellij-community/commit/cc31a979b19c97fc05b8f86d883716ce3c45d1e1#diff-5b5191d65df57cc34c25265d1be88fc3daedb8529c3b9c462d29312fd8360941) after being deprecated and not needed
@@ -23,7 +23,6 @@ import com.intellij.mock.MockProject;
import com.intellij.openapi.Disposable;
import com.intellij.openapi.application.Application;
import com.intellij.openapi.application.ApplicationManager;
-import com.intellij.openapi.extensions.Extensions;
import com.intellij.openapi.fileTypes.FileTypeManager;
import com.intellij.openapi.util.Disposer;
import com.intellij.openapi.vfs.encoding.EncodingManager;
@@ -90,7 +89,6 @@ public class TestUtils {
@NotNull
public static MockProject mockProject(
@Nullable PicoContainer container, Disposable parentDisposable) {
- Extensions.registerAreaClass("IDEA_PROJECT", null);
container = container != null ? container : new DefaultPicoContainer();
return new MockProject(container, parentDisposable);
}
