Enable running of fasta tests on build bot.

pkg/front_end/lib/src/fasta/testing/suite.dart

Index: pkg/front_end/lib/src/fasta/testing/suite.dart
diff --git a/pkg/front_end/lib/src/fasta/testing/suite.dart b/pkg/front_end/lib/src/fasta/testing/suite.dart
index 045d01bacfff665be459679ebb38f81aa62dc527..cbe4cfec917a90c6e979ee10048c11f8f9bd49a2 100644
--- a/pkg/front_end/lib/src/fasta/testing/suite.dart
+++ b/pkg/front_end/lib/src/fasta/testing/suite.dart
@@ -99,7 +99,7 @@ class FeContext extends TestContext {
 
   Future<Program> platform;
 
-  FeContext(String sdk, Uri vm, Uri packages, bool strongMode,
+  FeContext(Uri sdk, Uri vm, Uri packages, bool strongMode,
       DartSdk dartSdk, bool updateExpectations, this.uriTranslator,
       bool fullCompile, AstKind astKind)
       : steps = <Step>[
@@ -140,7 +140,7 @@ class FeContext extends TestContext {
   }
 
   static Future<FeContext> create(Chain suite, Map<String, String> environment,
-      String sdk, Uri vm, Uri packages, bool strongMode, DartSdk dartSdk,
+      Uri sdk, Uri vm, Uri packages, bool strongMode, DartSdk dartSdk,
       bool updateExpectations) async {
     TranslateUri uriTranslator = await TranslateUri.parse(packages);
     String astKindString = environment[AST_KIND_INDEX];