Use a direct include of strings headers in chromeos/.

chromeos/dbus/power_policy_controller.cc

 // Copyright (c) 2013 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 "chromeos/dbus/power_policy_controller.h"
 
 #include "base/format_macros.h"
 #include "base/logging.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 
 namespace chromeos {
 
 namespace {
 
 // Appends a description of |field|, a field within |delays|, a
 // power_manager::PowerManagementPolicy::Delays object, to |str|, an
 // std::string, if the field is set.  |name| is a char* describing the
 // field.
@@ skipping 230 matching lines @@
   if (!reason.empty())
     policy.set_reason(reason);
   client_->SetPolicy(policy);
 }
 
 void PowerPolicyController::SendEmptyPolicy() {
   client_->SetPolicy(power_manager::PowerManagementPolicy());
 }
 
 }  // namespace chromeos