Dart server-communication sample is broken

[kwalrath]

It hasn't worked for a while. (I'm not positive it ever worked.)

https://github.com/angular/angular.io/tree/master/public/docs/_examples/server-communication/dart

Contributions welcome...

[chalin]

Under beta.17, a pub build yields:

Loading source assets...
Loading angular2/transform/codegen, dart_to_js_script_rewriter, observe and smoke/src/default_transformer transformers...
Loading angular2 transformers...
Building server_communication...
[Error from DirectiveMetadataLinker on server_communication|lib/toh/hero_service.ng_summary.json with input server_communication|lib/toh/hero_service.ng_meta.json]:
Missing identifier "BrowserClient" needed by "HeroService" from metadata map
[Error from DirectiveMetadataLinker on server_communication|lib/toh/toh_component.ng_summary.json with input server_communication|lib/toh/toh_component.ng_meta.json]:
Missing identifier "BrowserClient" needed by "TohComponent" from metadata map
[Info from Dart2JS]:
Compiling server_communication|web/main.dart...
[Error from Dart2JS on server_communication|web/main.dart]:
web/main.ngfactory.dart:8:1:
Can't read 'package:server_communication/toh/toh_component.ngfactory.dart' (Could not find asset server_communication|lib/toh/toh_component.ngfactory.dart.).
import 'package:server_communication/toh/toh_component.ngfactory.dart' as i1;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[Dart2JS]:
web/main.dart:

This problem ("Missing identifier ..."), and its solution are documented in https://github.com/angular/angular/wiki/Angular-2-Dart-Transformer#resolved_identifiers

The app works once more after updating the pubspec.yaml to (only excerpts shown):

name: server_communication ...
dependencies:
  angular2: 2.0.0-beta.17 ...
transformers:
- angular2: ...
    resolved_identifiers:
        BrowserClient: 'package:http/browser_client.dart'

Fixed in #1219.

cf. angular/angular#8189