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

chrome/browser/safe_browsing/protocol_manager_helper.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/protocol_manager_helper.h"
 
 #ifndef NDEBUG
 #include "base/base64.h"
 #endif
 #include "base/environment.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/env_vars.h"
 #include "google_apis/google_api_keys.h"
 #include "net/base/escape.h"
 
 SafeBrowsingProtocolConfig::SafeBrowsingProtocolConfig()
     : disable_auto_update(false) {
 }
 
 SafeBrowsingProtocolConfig::~SafeBrowsingProtocolConfig() {
@@ skipping 23 matching lines @@
     base::StringAppendF(&url, "&key=%s",
                         net::EscapeQueryParamValue(api_key, true).c_str());
   }
   if (!additional_query.empty()) {
     DCHECK(url.find("?") != std::string::npos);
     url.append("&");
     url.append(additional_query);
   }
   return url;
 }