Use a direct include of strings headers in chrome/browser/r*-s*/.

chrome/browser/safe_browsing/browser_feature_extractor_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/safe_browsing/browser_feature_extractor.h"
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "base/time.h"
 #include "chrome/browser/history/history_backend.h"
 #include "chrome/browser/history/history_service.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/safe_browsing/browser_features.h"
 #include "chrome/browser/safe_browsing/client_side_detection_service.h"
 #include "chrome/browser/safe_browsing/ui_manager.h"
 #include "chrome/common/safe_browsing/csd.pb.h"
 #include "chrome/test/base/chrome_render_view_host_test_harness.h"
@@ skipping 545 matching lines @@
   EXPECT_TRUE(hosts.find("evil.com") != hosts.end());
   feature_name = base::StringPrintf("%s%s", features::kBadIpFetch,
                                     "92.92.92.92");
   EXPECT_TRUE(features.count(feature_name));
   hosts = features[feature_name];
   EXPECT_EQ(2U, hosts.size());
   EXPECT_TRUE(hosts.find("bad.com") != hosts.end());
   EXPECT_TRUE(hosts.find("evil.com") != hosts.end());
 }
 }  // namespace safe_browsing