Add SpdyString alias for std::string in net/spdy.

net/spdy/hpack/hpack_entry.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 NET_SPDY_HPACK_HPACK_ENTRY_H_
 #define NET_SPDY_HPACK_HPACK_ENTRY_H_
 
 #include <stddef.h>
 
-#include <string>
-
 #include "base/macros.h"
 #include "net/base/net_export.h"
+#include "net/spdy/platform/api/spdy_string.h"
 #include "net/spdy/platform/api/spdy_string_piece.h"
 
 // All section references below are to
 // http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-08
 
 namespace net {
 
 // A structure for an entry in the static table (3.3.1)
 // and the header table (3.3.2).
 class NET_EXPORT_PRIVATE HpackEntry {
@@ skipping 40 matching lines @@
   // Returns whether this entry is a lookup-only entry.
   bool IsLookup() const { return type_ == LOOKUP; }
 
   // Used to compute the entry's index in the header table.
   size_t InsertionIndex() const { return insertion_index_; }
 
   // Returns the size of an entry as defined in 5.1.
   static size_t Size(SpdyStringPiece name, SpdyStringPiece value);
   size_t Size() const;
 
-  std::string GetDebugString() const;
+  SpdyString GetDebugString() const;
 
   int64_t time_added() const { return time_added_; }
   void set_time_added(int64_t now) { time_added_ = now; }
 
   // Returns the estimate of dynamically allocated memory in bytes.
   size_t EstimateMemoryUsage() const;
 
  private:
   enum EntryType {
     LOOKUP,
     DYNAMIC,
     STATIC,
   };
 
   // These members are not used for LOOKUP entries.
-  std::string name_;
-  std::string value_;
+  SpdyString name_;
+  SpdyString value_;
 
   // These members are always valid. For DYNAMIC and STATIC entries, they
   // always point to |name_| and |value_|.
   SpdyStringPiece name_ref_;
   SpdyStringPiece value_ref_;
 
   // The entry's index in the total set of entries ever inserted into the header
   // table.
   size_t insertion_index_;
 
   EntryType type_;
 
   // For HpackHeaderTable::DebugVisitorInterface
   int64_t time_added_;
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_HPACK_HPACK_ENTRY_H_