Use a direct include of strings headers in chrome/browser/extensions/, part 4.

chrome/browser/extensions/test_management_policy.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_TEST_MANAGEMENT_POLICY_H_
 #define CHROME_BROWSER_EXTENSIONS_TEST_MANAGEMENT_POLICY_H_
 
 #include <string>
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/management_policy.h"
 
 namespace extensions {
 // This class provides a simple way to create providers with specific
 // restrictions and a known error message, for use in testing.
 class TestManagementPolicyProvider : public ManagementPolicy::Provider {
  public:
   enum AllowedActionFlag {
     ALLOW_ALL = 0,
@@ skipping 24 matching lines @@
 
  private:
   bool may_load_;
   bool may_modify_status_;
   bool must_remain_enabled_;
 
   string16 error_message_;
 };
 }  // namespace
 #endif  // CHROME_BROWSER_EXTENSIONS_TEST_MANAGEMENT_POLICY_H_