[Sync] Removing duplicate includes, part 2.

components/sync/base/cryptographer_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/sync/base/cryptographer.h"
 
-#include <string>
-
 #include "base/strings/string_util.h"
 #include "components/sync/base/fake_encryptor.h"
 #include "components/sync/protocol/password_specifics.pb.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace syncer {
 
 namespace {
 
@@ skipping 278 matching lines @@
   ASSERT_TRUE(another_cryptographer.CanDecrypt(keys));
   another_cryptographer.InstallKeys(keys);
 
   // Verify that bootstrapped cryptographer decrypts succesfully using
   // all the keys after key installation.
   EXPECT_TRUE(another_cryptographer.CanDecrypt(encrypted_k1));
   EXPECT_TRUE(another_cryptographer.CanDecrypt(encrypted_k2));
 }
 
 }  // namespace syncer