anchor.diff:  import "package:googleapis/common/common.dart" as common_external;
   import "package:http_base/http_base.dart" as http_base;
   
  -const CONTENT_TYPE_UTF8 = 'application/json; charset=utf-8';
  +const CONTENT_TYPE_JSON_UTF8 = 'application/json; charset=utf-8';
   
   class HeadersImpl implements http_base.Headers {
     final Map<String, List<String>> _m = {};
  
positive.code:     });
    }
  
    // TODO: Handle [downloadOptions] -- e.g. partial media downloads.
    Future _request(String requestUrl, String method,
                    String body, Map urlParams, Map queryParams,
                    common_external.Media uploadMedia,
  
negative.code:         }
  
          test('simple', () {
            var bytes = new List.generate(10 * 256 * 1024 + 1, (i) => i % 256);
            var expectations = [
                {
                  'url' : 'http://example.com/xyz?uploadType=media',
  