Switch FE to use the libraries.json format.

pkg/front_end/test/incremental_kernel_generator_test.dart

Index: pkg/front_end/test/incremental_kernel_generator_test.dart
diff --git a/pkg/front_end/test/incremental_kernel_generator_test.dart b/pkg/front_end/test/incremental_kernel_generator_test.dart
index 9195343d6e309c864bc6d5a78f016df518e07ab6..4a892c86495a8f296bbffab864f51d2f53115c4f 100644
--- a/pkg/front_end/test/incremental_kernel_generator_test.dart
+++ b/pkg/front_end/test/incremental_kernel_generator_test.dart
@@ -36,18 +36,16 @@ class IncrementalKernelGeneratorTest {
   /// Compute the initial [Program] for the given [entryPoint].
   Future<Program> getInitialState(Uri entryPoint,
       {bool setPackages: true}) async {
-    Map<String, Uri> dartLibraries = createSdkFiles(fileSystem);
+    createSdkFiles(fileSystem);
     // TODO(scheglov) Builder the SDK kernel and set it into the options.
 
-    // TODO(scheglov) Make `.packages` file optional.
-
     var compilerOptions = new CompilerOptions()
       ..fileSystem = fileSystem
       ..byteStore = new MemoryByteStore()
 //      ..logger = new PerformanceLog(stdout)
       ..strongMode = true
       ..chaseDependencies = true
-      ..dartLibraries = dartLibraries;
+      ..librariesSpecUri = Uri.parse('file:///sdk/lib/libraries.json');

[ahe, 2017/08/03 11:58:16]

Ditto.

[Siggi Cherem (dart-lang), 2017/08/05 00:41:02]

Similarly, this tests relies on the file://* scheme already

 
     if (setPackages) {
       compilerOptions.packagesFileUri = Uri.parse('file:///test/.packages');