Revert "Use native async/await support in pub."

sdk/lib/_internal/pub_generated/test/implicit_dependency_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:pub_semver/pub_semver.dart';
 
 import 'descriptor.dart' as d;
 import 'test_pub.dart';
 import '../lib/src/barback.dart' as barback;
 
@@ skipping 10 matching lines @@
         builder.serve("stack_trace", max("stack_trace"));
         builder.serve("source_span", current("source_span"));
       });
 
       d.appDir({
         "barback": "any"
       }).create();
 
       pubCommand(command);
 
-      d.packagesDir({"stack_trace": nextPatch("stack_trace")}).validate();
+      d.packagesDir({
+        "stack_trace": nextPatch("stack_trace")
+      }).validate();
     });
 
-    integration("pub's implicit constraint uses the same source and "
-        "description as a dependency override", () {
+    integration(
+        "pub's implicit constraint uses the same source and "
+            "description as a dependency override",
+        () {
       servePackages((builder) {
         builder.serve("barback", current("barback"));
         builder.serve("stack_trace", nextPatch("stack_trace"));
         builder.serve("source_span", current("source_span"));
       });
 
-      d.dir("stack_trace", [
-        d.libDir("stack_trace", 'stack_trace ${current("stack_trace")}'),
-        d.libPubspec("stack_trace", current("stack_trace"))
-      ]).create();
+      d.dir(
+          "stack_trace",
+          [
+              d.libDir("stack_trace", 'stack_trace ${current("stack_trace")}'),
+              d.libPubspec("stack_trace", current("stack_trace"))]).create();
 
-      d.dir(appPath, [
-        d.pubspec({
+      d.dir(appPath, [d.pubspec({
           "name": "myapp",
-          "dependencies": {"barback": "any"},
+          "dependencies": {
+            "barback": "any"
+          },
           "dependency_overrides": {
-            "stack_trace": {"path": "../stack_trace"},
+            "stack_trace": {
+              "path": "../stack_trace"
+            },
           }
-        })
-      ]).create();
+        })]).create();
 
       pubCommand(command);
 
       // Validate that we're using the path dependency version of stack_trace
       // rather than the hosted version.
       d.packagesDir({
         "stack_trace": current("stack_trace")
       }).validate();
     });
 
-    integration("doesn't add a constraint if barback isn't in the package "
-        "graph", () {
+    integration(
+        "doesn't add a constraint if barback isn't in the package " "graph",
+        () {
       servePackages((builder) {
         builder.serve("stack_trace", previous("stack_trace"));
         builder.serve("stack_trace", current("stack_trace"));
         builder.serve("stack_trace", nextPatch("stack_trace"));
         builder.serve("stack_trace", max("stack_trace"));
         builder.serve("source_span", current("source_span"));
       });
 
       d.appDir({
         "stack_trace": "any"
       }).create();
 
       pubCommand(command);
 
-      d.packagesDir({"stack_trace": max("stack_trace")}).validate();
+      d.packagesDir({
+        "stack_trace": max("stack_trace")
+      }).validate();
     });
   });
 
-  integration("unlocks if the locked version doesn't meet pub's "
-      "constraint", () {
+  integration(
+      "unlocks if the locked version doesn't meet pub's " "constraint",
+      () {
     servePackages((builder) {
       builder.serve("barback", current("barback"));
       builder.serve("stack_trace", previous("stack_trace"));
       builder.serve("stack_trace", current("stack_trace"));
       builder.serve("source_span", current("source_span"));
     });
 
-    d.appDir({"barback": "any"}).create();
+    d.appDir({
+      "barback": "any"
+    }).create();
 
     // Hand-create a lockfile to pin the package to an older version.
     createLockFile("myapp", hosted: {
       "barback": current("barback"),
       "stack_trace": previous("stack_trace")
     });
 
     pubGet();
 
     // It should be upgraded.
     d.packagesDir({
       "stack_trace": current("stack_trace")
     }).validate();
   });
 }
 
 String current(String packageName) =>
     barback.pubConstraints[packageName].min.toString();
 
 String previous(String packageName) {
   var constraint = barback.pubConstraints[packageName];
-  return new Version(constraint.min.major, constraint.min.minor - 1, 0)
-      .toString();
+  return new Version(
+      constraint.min.major,
+      constraint.min.minor - 1,
+      0).toString();
 }
 
 String nextPatch(String packageName) =>
     barback.pubConstraints[packageName].min.nextPatch.toString();
 
 String max(String packageName) =>
     barback.pubConstraints[packageName].max.toString();