Remove deprecated Expect from the libraries.

tests/standalone/status_expression_test.dart

 // Copyright (c) 2011, 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.
 
 library StatusExpressionTest;
 
 import "package:expect/expect.dart";
 import "../../tools/testing/dart/status_expression.dart";
 
 
@@ skipping 47 matching lines @@
 
   static void test3() {
     var thrown;
     String input = r" $mode == debug && ($arch==chromium || *$arch == dartc)";
     Tokenizer tokenizer = new Tokenizer(input);
     try {
       tokenizer.tokenize();
     } on Exception catch (e) {
       thrown = e;
     }
-    Expect.equals("Syntax error in '$input'", thrown.toString());
+    Expect.equals("Exception: Syntax error in '$input'", thrown.toString());
   }
 
   static void test4() {
     var thrown;
     String input =
         r"($arch == (-dartc || $arch == chromium) && $mode == release";
     Tokenizer tokenizer = new Tokenizer(input);
     try {
       tokenizer.tokenize();
     } on Exception catch (e) {
       thrown = e;
     }
-    Expect.equals("Syntax error in '$input'", thrown.toString());
+    Expect.equals("Exception: Syntax error in '$input'", thrown.toString());
   }
 
   static void test5() {
     Tokenizer tokenizer = new Tokenizer(
         r"Skip , Pass if $arch == dartc, Fail || Timeout if "
         r"$arch == chromium && $mode == release");
     tokenizer.tokenize();
     ExpressionParser parser =
         new ExpressionParser(new Scanner(tokenizer.tokens));
     SetExpression ast = parser.parseSetExpression();
@@ skipping 49 matching lines @@
     environment["arch"] = "arm";
     Expect.isFalse(ast.evaluate(environment));
     environment["checked"] = true;
     Expect.isFalse(ast.evaluate(environment));
   }
 }
 
 main() {
   StatusExpressionTest.testMain();
 }