Don't run the "pkg" tests on the dart binary in the SDK.

tools/testing/dart/test_suite.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 90 matching lines @@
   final Map configuration;
   final String suiteName;
 
   TestSuite(this.configuration, this.suiteName);
 
   /**
    * Whether or not binaries should be found in the root build directory or
    * in the built SDK.
    */
   bool get useSdk {
-    // Some suites always use the SDK.
-    // TODO(rnystrom): Eventually, all tests should run out of the SDK and this
-    // check should go away.
-    if (['pkg', 'pub'].contains(suiteName)) return true;
+    // The pub suite always uses the SDK.
+    // TODO(rnystrom): Eventually, all test suites should run out of the SDK
+    // and this check should go away.
+    if (suiteName == 'pub') return true;
 
     return configuration['use_sdk'];
   }
 
   /**
    * The output directory for this suite's configuration.
    */
   String get buildDir => TestUtils.buildDir(configuration);
 
   /**
@@ skipping 1681 matching lines @@
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout
  * $compileErrorSkip tests are skipped on browsers due to compile-time error
 """;
     print(report);
    }
 }