Use of base::StringPairs appropriately in disk_cache

net/disk_cache/disk_cache.h

Index: net/disk_cache/disk_cache.h
diff --git a/net/disk_cache/disk_cache.h b/net/disk_cache/disk_cache.h
index 769ab361b199695bc68827815fc3e481cf39666a..84c1ee99516654258486494a8afeacfb70ddc31d 100644
--- a/net/disk_cache/disk_cache.h
+++ b/net/disk_cache/disk_cache.h
@@ -14,6 +14,7 @@
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/strings/string_split.h"
 #include "base/time/time.h"
 #include "net/base/cache_type.h"
 #include "net/base/completion_callback.h"
@@ -149,8 +150,7 @@ class NET_EXPORT Backend {
   virtual scoped_ptr<Iterator> CreateIterator() = 0;
 
   // Return a list of cache statistics.
-  virtual void GetStats(
-      std::vector<std::pair<std::string, std::string> >* stats) = 0;
+  virtual void GetStats(base::StringPairs* stats) = 0;
 
   // Called whenever an external cache in the system reuses the resource
   // referred to by |key|.