Use a direct include of strings headers in chrome/browser/i*/.

chrome/browser/importer/ie_importer_unittest_win.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 "testing/gtest/include/gtest/gtest.h"
 
 #include <windows.h>
 
 #include <vector>
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "components/webdata/encryptor/ie7_password.h"
 
 TEST(IEImporterTest, IE7Importer) {
   // This is the unencrypted values of my keys under Storage2.
   // The passwords have been manually changed to abcdef... but the size remains
   // the same.
   unsigned char data1[] = "\x0c\x00\x00\x00\x38\x00\x00\x00\x2c\x00\x00\x00"
                           "\x57\x49\x43\x4b\x18\x00\x00\x00\x02\x00\x00\x00"
                           "\x67\x00\x72\x00\x01\x00\x00\x00\x00\x00\x00\x00"
                           "\x00\x00\x00\x00\x4e\xfa\x67\x76\x22\x94\xc8\x01"
@@ skipping 29 matching lines @@
   ASSERT_TRUE(ie7_password::GetUserPassFromData(decrypted_data1, &username,
                                                 &password));
   EXPECT_EQ(L"abcdefgh", username);
   EXPECT_EQ(L"abcdefghijkl", password);
 
   ASSERT_TRUE(ie7_password::GetUserPassFromData(decrypted_data2, &username,
                                                 &password));
   EXPECT_EQ(L"abcdefghi", username);
   EXPECT_EQ(L"abcdefg", password);
 }