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

chrome/browser/chromeos/extensions/echo_private_api.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/extensions/echo_private_api.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/location.h"
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time.h"
 #include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_settings.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/chromeos/system/statistics_provider.h"
 #include "chrome/browser/chromeos/ui/echo_dialog_view.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/common/extensions/api/echo_private.h"
 #include "chrome/common/extensions/extension.h"
@@ skipping 218 matching lines @@
 void EchoPrivateGetUserConsentFunction::Finalize(bool consent) {
   // Consent should not be true if offers redeeming is disabled.
   CHECK(redeem_offers_allowed_ || !consent);
   results_ = echo_api::GetUserConsent::Results::Create(consent);
   SendResponse(true);
 
   // Release the reference added in |OnRedeemOffersAllowedChecked|, before
   // showing the dialog.
   Release();
 }