Transition barback's infrastructure to an aggregate-based model.

pkg/barback/test/package_graph/transform/cross_package_test.dart

Index: pkg/barback/test/package_graph/transform/cross_package_test.dart
diff --git a/pkg/barback/test/package_graph/transform/cross_package_test.dart b/pkg/barback/test/package_graph/transform/cross_package_test.dart
index 6aaf58515536c246cdc35d4823188a2fd478a3d7..b499604680d968d767eb3ad36e6d30af09b0a8c6 100644
--- a/pkg/barback/test/package_graph/transform/cross_package_test.dart
+++ b/pkg/barback/test/package_graph/transform/cross_package_test.dart
@@ -190,37 +190,4 @@ main() {
     expectAsset("pkg1|a.out", "b");
     buildShouldSucceed();
   });
-
-  test("re-runs if the primary input is invalidated before accessing", () {
-    var transformer1 = new RewriteTransformer("txt", "mid");
-    var transformer2 = new RewriteTransformer("mid", "out");
-
-    initGraph([
-      "app|foo.txt"
-    ], {"app": [
-      [transformer1],
-      [transformer2]
-    ]});
-
-    transformer2.pausePrimaryInput();
-    updateSources(["app|foo.txt"]);
-
-    // Wait long enough to ensure that transformer1 has completed and
-    // transformer2 has started.
-    schedule(pumpEventQueue);
-
-    // Update the source again so that transformer1 invalidates the primary
-    // input of transformer2.
-    transformer1.pauseApply();
-    updateSources(["app|foo.txt"]);
-
-    transformer2.resumePrimaryInput();
-    transformer1.resumeApply();
-
-    expectAsset("app|foo.out", "foo.mid.out");
-    buildShouldSucceed();
-
-    expect(transformer1.numRuns, completion(equals(2)));
-    expect(transformer2.numRuns, completion(equals(2)));
-  });
 }