Remove "pub list" command.

utils/pub/system_cache.dart

Index: utils/pub/system_cache.dart
diff --git a/utils/pub/system_cache.dart b/utils/pub/system_cache.dart
index de236ac8067996018a1de0b5d924f3036e0baa45..56bd7e40e10c36198b6114823897634f084b0a91 100644
--- a/utils/pub/system_cache.dart
+++ b/utils/pub/system_cache.dart
@@ -51,25 +51,6 @@ class SystemCache {
   }
 
   /**
-   * Loads all of the package ids in the cache and returns them.
-   */
-  Future<List<PackageId>> listAll() {
-    return listDir(rootDir).chain((paths) {
-      final sources = paths.map((path) {
-        final source = sources[basename(path)];
-        return listDir(path).transform((subpaths) {
-          // TODO(rnystrom): Once there are cached packages and this path is
-          // being used, figure out how version numbers should be acquired.
-          return subpaths.map((subpath) =>
-            new PackageId(
-                basename(subpath), source, Version.none, basename(subpath)));
-        });
-      });
-      return Futures.wait(sources).transform(flatten);
-    });
-  }
-
-  /**
    * Ensures that the package identified by [id] is installed to the cache,
    * loads it, and returns it.
    *