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

chrome/browser/chromeos/input_method/candidate_window_view_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 "chrome/browser/chromeos/input_method/candidate_window_view.h"
 
 #include <string>
 
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chromeos/input_method/candidate_view.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/views/test/views_test_base.h"
 #include "ui/views/widget/widget.h"
 
 namespace chromeos {
 namespace input_method {
 
 namespace {
@@ skipping 363 matching lines @@
   for (size_t i = 1; i < candidate_window_view.candidate_views_.size(); ++i) {
     const CandidateView* view = candidate_window_view.candidate_views_[i];
     EXPECT_EQ(before_height, view->GetContentsBounds().height());
   }
 
   // We should call CloseNow method, otherwise this test will leak memory.
   widget->CloseNow();
 }
 }  // namespace input_method
 }  // namespace chromeos