Use a direct include of strings headers in content/browser/, part 1.

content/browser/accessibility/accessibility_tree_formatter_win.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 "content/browser/accessibility/accessibility_tree_formatter.h"
 
 #include <oleacc.h>
 
 #include <string>
 
 #include "base/files/file_path.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/accessibility/accessibility_tree_formatter_utils_win.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/accessibility/browser_accessibility_win.h"
 #include "content/common/accessibility_node_data.h"
 #include "third_party/iaccessible2/ia2_api_all.h"
 #include "ui/base/win/atl_module.h"
 
 using base::StringPrintf;
 
@@ skipping 286 matching lines @@
 const std::string AccessibilityTreeFormatter::GetAllowString() {
   return "@WIN-ALLOW:";
 }
 
 // static
 const std::string AccessibilityTreeFormatter::GetDenyString() {
   return "@WIN-DENY:";
 }
 
 }  // namespace content