Issue 15037. Warn users if they have “assets” dir anywhere inside “web” dir (http://dartbug.com/150…

sdk/lib/_internal/pub/lib/src/command/serve.dart

Index: sdk/lib/_internal/pub/lib/src/command/serve.dart
diff --git a/sdk/lib/_internal/pub/lib/src/command/serve.dart b/sdk/lib/_internal/pub/lib/src/command/serve.dart
index f6df4ce2fe875ac7821f58fbd8065b3c0286a705..f99df217e9a575e587ba7f772b0d6c1f00267582 100644
--- a/sdk/lib/_internal/pub/lib/src/command/serve.dart
+++ b/sdk/lib/_internal/pub/lib/src/command/serve.dart
@@ -65,9 +65,7 @@ class ServeCommand extends PubCommand {
       return flushThenExit(exit_codes.USAGE);
     }
 
-    return entrypoint.ensureLockFileIsUpToDate().then((_) {
-      return entrypoint.loadPackageGraph();
-    }).then((graph) {
+    return entrypoint.loadPackageGraph().then((graph) {
       var builtInTransformers = [new DartForwardingTransformer(mode)];
       if (useDart2JS) {
         builtInTransformers.add(new Dart2JSTransformer(graph, mode));