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

sdk/lib/_internal/pub_generated/lib/src/lock_file.dart

Index: sdk/lib/_internal/pub_generated/lib/src/lock_file.dart
diff --git a/sdk/lib/_internal/pub/lib/src/lock_file.dart b/sdk/lib/_internal/pub_generated/lib/src/lock_file.dart
similarity index 78%
copy from sdk/lib/_internal/pub/lib/src/lock_file.dart
copy to sdk/lib/_internal/pub_generated/lib/src/lock_file.dart
index 99b233276294f5baeeffa3de32bbfadd9b67f9da..fa964c70f803c727c63f53ef171d8ed8ff06630f 100644
--- a/sdk/lib/_internal/pub/lib/src/lock_file.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/lock_file.dart
@@ -32,7 +32,7 @@ class LockFile {
   LockFile._(this.packages);
 
   LockFile.empty()
-    : packages = <String, PackageId>{};
+      : packages = <String, PackageId>{};
 
   /// Loads a lockfile from [filePath].
   factory LockFile.load(String filePath, SourceRegistry sources) {
@@ -62,39 +62,50 @@ class LockFile {
 
     var packageEntries = parsed['packages'];
     if (packageEntries != null) {
-      _validate(packageEntries is Map, 'The "packages" field must be a map.',
+      _validate(
+          packageEntries is Map,
+          'The "packages" field must be a map.',
           parsed.nodes['packages']);
 
       packageEntries.forEach((name, spec) {
         // Parse the version.
-        _validate(spec.containsKey('version'),
-            'Package $name is missing a version.', spec);
+        _validate(
+            spec.containsKey('version'),
+            'Package $name is missing a version.',
+            spec);
         var version = new Version.parse(spec['version']);
 
         // Parse the source.
-        _validate(spec.containsKey('source'),
-            'Package $name is missing a source.', spec);
+        _validate(
+            spec.containsKey('source'),
+            'Package $name is missing a source.',
+            spec);
         var sourceName = spec['source'];
 
-        _validate(spec.containsKey('description'),
-            'Package $name is missing a description.', spec);
+        _validate(
+            spec.containsKey('description'),
+            'Package $name is missing a description.',
+            spec);
         var description = spec['description'];
 
         // Let the source parse the description.
         var source = sources[sourceName];
         try {
-          description = source.parseDescription(filePath, description,
-              fromLockFile: true);
+          description =
+              source.parseDescription(filePath, description, fromLockFile: true);
         } on FormatException catch (ex) {
-          throw new SourceSpanFormatException(ex.message,
+          throw new SourceSpanFormatException(
+              ex.message,
               spec.nodes['source'].span);
         }
 
         var id = new PackageId(name, sourceName, version, description);
 
         // Validate the name.
-        _validate(name == id.name,
-            "Package name $name doesn't match ${id.name}.", spec);
+        _validate(
+            name == id.name,
+            "Package name $name doesn't match ${id.name}.",
+            spec);
 
         packages[name] = id;
       });
@@ -117,8 +128,8 @@ class LockFile {
     // Convert the dependencies to a simple object.
     var data = {};
     packages.forEach((name, package) {
-      var description = sources[package.source].serializeDescription(packageDir,
-          package.description);
+      var description =
+          sources[package.source].serializeDescription(packageDir, package.description);
 
       data[name] = {
         'version': package.version.toString(),