Revert "Support relative paths in path dependencies."

utils/tests/pub/lock_file_test.dart

Index: utils/tests/pub/lock_file_test.dart
diff --git a/utils/tests/pub/lock_file_test.dart b/utils/tests/pub/lock_file_test.dart
index cd57bd127d3c5a923065de3c07365f03e6d9d712..eeef7bf2716de40682bf8346148958fd0d90bb6a 100644
--- a/utils/tests/pub/lock_file_test.dart
+++ b/utils/tests/pub/lock_file_test.dart
@@ -17,10 +17,8 @@ class MockSource extends Source {
   final String name = 'mock';
   final bool shouldCache = false;
 
-  dynamic parseDescription(String filePath, String description,
-                           {bool fromLockFile: false}) {
+  void validateDescription(String description, {bool fromLockFile: false}) {
     if (!description.endsWith(' desc')) throw new FormatException();
-    return description;
   }
 
   String packageName(String description) {