Use a direct include of strings headers in crypto/, dbus/, device/.

crypto/encryptor_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 "crypto/encryptor.h"
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
-#include "base/string_number_conversions.h"
+#include "base/strings/string_number_conversions.h"
 #include "crypto/symmetric_key.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 TEST(EncryptorTest, EncryptDecrypt) {
   scoped_ptr<crypto::SymmetricKey> key(
       crypto::SymmetricKey::DeriveKeyFromPassword(
           crypto::SymmetricKey::AES, "password", "saltiest", 1000, 256));
   EXPECT_TRUE(NULL != key.get());
 
   crypto::Encryptor encryptor;
@@ skipping 340 matching lines @@
   crypto::Encryptor encryptor;
   // The IV must be exactly as long a the cipher block size.
   EXPECT_EQ(16U, iv.size());
   EXPECT_TRUE(encryptor.Init(sym_key.get(), crypto::Encryptor::CBC, iv));
 
   std::string ciphertext;
   EXPECT_TRUE(encryptor.Encrypt(plaintext, &ciphertext));
   EXPECT_EQ(expected_ciphertext_hex, base::HexEncode(ciphertext.data(),
                                                      ciphertext.size()));
 }