Use of base::StringPairs appropriately in stats.h

net/disk_cache/blockfile/stats.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 NET_DISK_CACHE_BLOCKFILE_STATS_H_
 #define NET_DISK_CACHE_BLOCKFILE_STATS_H_
 
 #include <string>
-#include <vector>
 
 #include "base/basictypes.h"
+#include "base/strings/string_split.h"
 #include "net/base/net_export.h"
 #include "net/disk_cache/blockfile/addr.h"
 
 namespace base {
 class HistogramSamples;
 }  // namespace base
 
 namespace disk_cache {
 
-typedef std::vector<std::pair<std::string, std::string> > StatsItems;
+using StatsItems = base::StringPairs;
 
 // This class stores cache-specific usage information, for tunning purposes.
 class NET_EXPORT_PRIVATE Stats {
  public:
   static const int kDataSizesLength = 28;
   enum Counters {
     MIN_COUNTER = 0,
     OPEN_MISS = MIN_COUNTER,
     OPEN_HIT,
     CREATE_MISS,
@@ skipping 60 matching lines @@
   Addr storage_addr_;
   int data_sizes_[kDataSizesLength];
   int64 counters_[MAX_COUNTER];
 
   DISALLOW_COPY_AND_ASSIGN(Stats);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_BLOCKFILE_STATS_H_