Updated tests/compiler/* to use new library syntax.

tests/compiler/dart2js/generate_at_use_site_test.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.
 
-#import("compiler_helper.dart");
+import 'compiler_helper.dart';
 
 const String FIB = r"""
 fib(n) {
   if (n <= 1) return 1;
   return add(fib(n - 1), fib(n - 2));
 }
 
 // We need this artificial add method because
 // our optimizer will actually add type checks
 // for the result of recursively calling fib
 // which introduces new variables because we
 // now have multiple users.
 // The 'if' has been added to avoid inlining of add.
 add(x, y) {
   if (x == -1) return x;
   return x + y;
 }
 """;
 
 main() {
   // Make sure we don't introduce a new variable.
   RegExp regexp = new RegExp("var $anyIdentifier =");
   compileAndDoNotMatch(FIB, 'fib', regexp);
 }