Remove more dead code

pkg/analysis_server/test/test_all.dart

Index: pkg/analysis_server/test/test_all.dart
diff --git a/pkg/analysis_server/test/test_all.dart b/pkg/analysis_server/test/test_all.dart
index e9baea671edc15fed5a7b9318dbccd82f825c4a0..1190c6cda34d01e9a1a66dfac03edcfe50366ecd 100644
--- a/pkg/analysis_server/test/test_all.dart
+++ b/pkg/analysis_server/test/test_all.dart
@@ -21,7 +21,6 @@ import 'protocol_test.dart' as protocol_test;
 import 'search/test_all.dart' as search_all;
 import 'services/test_all.dart' as services_all;
 import 'socket_server_test.dart' as socket_server_test;
-import 'source/test_all.dart' as source_all;
 import 'src/test_all.dart' as src_all;
 
 /**
@@ -46,7 +45,6 @@ main() {
     search_all.main();
     services_all.main();
     socket_server_test.main();
-    source_all.main();
     src_all.main();
   }, name: 'analysis_server');
 }