Remove deprecated Expect from the libraries.

tests/language/inlined_throw_test.dart

 // Copyright (c) 2013, 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.
 
 // Dart test program to test check that we don't fail to compile when an
 // inlinable method contains a throw.
 
+import 'package:expect/expect.dart';
+
 var x = false;
 
 bool called;
 
 bool callMeTrue() {
   called = true;
   return true;
 }
 
 bool callMeFalse() {
@@ skipping 152 matching lines @@
   testCallThenThrow(call3c);
   testCallThenThrow(call4c);
   Expect.throws(sendSet);
   testCallThenThrow(sendSetCallThrow);
   Expect.throws(isSend);
   testNoThrow(vile);
   testCallThenThrow(dovile);
   testCall(dovileBreak);
   testCallThenThrow(dovileContinue);
 }