Refactor Source.

sdk/lib/_internal/pub/lib/src/command/cache_repair.dart

Index: sdk/lib/_internal/pub/lib/src/command/cache_repair.dart
diff --git a/sdk/lib/_internal/pub/lib/src/command/cache_repair.dart b/sdk/lib/_internal/pub/lib/src/command/cache_repair.dart
index 450951b238b2330d47351266e0f9a0f991d9dcd0..5a1a557941da898c31552204d5f1da68a56f24c9 100644
--- a/sdk/lib/_internal/pub/lib/src/command/cache_repair.dart
+++ b/sdk/lib/_internal/pub/lib/src/command/cache_repair.dart
@@ -10,6 +10,7 @@ import '../command.dart';
 import '../exit_codes.dart' as exit_codes;
 import '../io.dart';
 import '../log.dart' as log;
+import '../source/cached.dart';
 import '../utils.dart';
 
 /// Handles the `cache repair` pub command.
@@ -24,7 +25,7 @@ class CacheRepairCommand extends PubCommand {
 
     // Repair every cached source.
     return Future.forEach(cache.sources.where(
-        (source) => source.shouldCache), (source) {
+        (source) => source is CachedSource), (source) {
       return source.repairCachedPackages().then((results) {
         successes += results.first;
         failures += results.last;