Use base::StringPairs where appropriate from /content

content/public/common/resource_devtools_info.h

 // Copyright 2014 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 CONTENT_COMMON_RESOURCE_DEVTOOLS_INFO_H_
 #define CONTENT_COMMON_RESOURCE_DEVTOOLS_INFO_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
+#include "base/strings/string_split.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 struct ResourceDevToolsInfo : base::RefCounted<ResourceDevToolsInfo> {
-  typedef std::vector<std::pair<std::string, std::string> >
-      HeadersVector;
+  typedef base::StringPairs HeadersVector;
 
   CONTENT_EXPORT ResourceDevToolsInfo();
 
   int32 http_status_code;
   std::string http_status_text;
   HeadersVector request_headers;
   HeadersVector response_headers;
   std::string request_headers_text;
   std::string response_headers_text;
 
  private:
   friend class base::RefCounted<ResourceDevToolsInfo>;
   CONTENT_EXPORT ~ResourceDevToolsInfo();
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_RESOURCE_DEVTOOLS_INFO_H_