Remove disable of GZIP, as it's no longer on by default anymore.

sdk/lib/_internal/pub_generated/lib/src/barback/base_server.dart

Index: sdk/lib/_internal/pub_generated/lib/src/barback/base_server.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/barback/base_server.dart b/sdk/lib/_internal/pub_generated/lib/src/barback/base_server.dart
index 42d56240bb86e9bc63304a6bd7877c8a1c6cdf5e..6cf7ab3540a7974a173ffd6ab43b9d0ad8c30a31 100644
--- a/sdk/lib/_internal/pub_generated/lib/src/barback/base_server.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/barback/base_server.dart
@@ -20,10 +20,7 @@ abstract class BaseServer<T> {
     shelf_io.serveRequests(
         _server,
         const shelf.Pipeline().addMiddleware(
-            shelf.createMiddleware(
-                errorHandler: _handleError)).addMiddleware(
-                    shelf.createMiddleware(
-                        responseHandler: _disableGzip)).addHandler(handleRequest));
+            shelf.createMiddleware(errorHandler: _handleError)).addHandler(handleRequest));
   }
   Future close() {
     return Future.wait([_server.close(), _resultsController.close()]);
@@ -77,12 +74,4 @@ abstract class BaseServer<T> {
     close();
     return new shelf.Response.internalServerError();
   }
-  _disableGzip(shelf.Response response) {
-    if (!response.headers.containsKey('Content-Encoding')) {
-      return response.change(headers: {
-        'Content-Encoding': ''
-      });
-    }
-    return response;
-  }
 }