Reverting 9767.

utils/pub/lock_file.dart

Index: utils/pub/lock_file.dart
diff --git a/utils/pub/lock_file.dart b/utils/pub/lock_file.dart
index d4227be2df7f939663cb2fce35846ced18fe13ad..92575fa9f5bd435f756c5c56ba641814c910fe76 100644
--- a/utils/pub/lock_file.dart
+++ b/utils/pub/lock_file.dart
@@ -4,7 +4,6 @@
 
 #library('lock_file');
 
-#import('dart:json');
 #import('package.dart');
 #import('source_registry.dart');
 #import('utils.dart');
@@ -61,7 +60,7 @@ class LockFile {
           throw new FormatException('Package $name is missing a description.');
         }
         var description = spec['description'];
-        source.validateDescription(description, fromLockFile: true);
+        source.validateDescription(description);
 
         var id = new PackageId(source, version, description);
 
@@ -77,22 +76,4 @@ class LockFile {
 
     return new LockFile._(packages);
   }
-
-  /**
-   * Returns the serialized YAML text of the lock file.
-   */
-  String serialize() {
-    var packagesObj = <Map>{};
-    packages.forEach((name, id) {
-      packagesObj[name] = {
-        'version': id.version.toString(),
-        'source': id.source.name,
-        'description': id.description
-      };
-    });
-
-    // TODO(nweiz): Serialize using the YAML library once it supports
-    // serialization. For now, we use JSON, since it's a subset of YAML anyway.
-    return JSON.stringify({'packages': packagesObj});
-  }
 }