Use a direct include of strings headers in chrome_frame/.

chrome_frame/navigation_constraints.cc

 // Copyright (c) 2010 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_frame/navigation_constraints.h"
 
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/common/url_constants.h"
 #include "chrome_frame/utils.h"
 #include "extensions/common/constants.h"
 
 NavigationConstraintsImpl::NavigationConstraintsImpl() : is_privileged_(false) {
 }
 
 // NavigationConstraintsImpl method definitions.
 bool NavigationConstraintsImpl::AllowUnsafeUrls() {
@@ skipping 60 matching lines @@
   return true;
 }
 
 bool NavigationConstraintsImpl::is_privileged() const {
   return is_privileged_;
 }
 
 void NavigationConstraintsImpl::set_is_privileged(bool is_privileged) {
   is_privileged_ = is_privileged;
 }