Fix analyzer hints and warnings in test/.

test/global/activate/activate_hosted_after_git_test.dart

 // Copyright (c) 2014, 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 'package:path/path.dart' as p;
 import 'package:pub/src/io.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   integration('activating a hosted package deactivates the Git one', () {
     servePackages((builder) {
       builder.serve("foo", "2.0.0", contents: [
         d.dir("bin", [
           d.file("foo.dart", "main(args) => print('hosted');")
         ])
       ]);
     });
 
     d.git('foo.git', [
       d.libPubspec("foo", "1.0.0"),
       d.dir("bin", [
         d.file("foo.dart", "main() => print('git');")
       ])
     ]).create();
 
     schedulePub(args: ["global", "activate", "-sgit", "../foo.git"]);
 
-    var path = canonicalize(p.join(sandboxDir, "foo"));
     schedulePub(args: ["global", "activate", "foo"], output: """
         Package foo is currently active from Git repository "../foo.git".
         Resolving dependencies...
         + foo 2.0.0
         Downloading foo 2.0.0...
         Precompiling executables...
         Loading source assets...
         Precompiled foo:foo.
         Activated foo 2.0.0.""");
 
     // Should now run the hosted one.
     var pub = pubRun(global: true, args: ["foo"]);
     pub.stdout.expect("hosted");
     pub.shouldExit();
   });
 }