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

net/spdy/buffered_spdy_framer.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_SPDY_BUFFERED_SPDY_FRAMER_H_
 #define NET_SPDY_BUFFERED_SPDY_FRAMER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
-#include <string>
 
 #include "base/macros.h"
 #include "net/base/net_export.h"
 #include "net/spdy/header_coalescer.h"
+#include "net/spdy/platform/api/spdy_string.h"
 #include "net/spdy/platform/api/spdy_string_piece.h"
 #include "net/spdy/spdy_alt_svc_wire_format.h"
 #include "net/spdy/spdy_framer.h"
 #include "net/spdy/spdy_header_block.h"
 #include "net/spdy/spdy_protocol.h"
 
 namespace net {
 
 class NET_EXPORT_PRIVATE BufferedSpdyFramerVisitorInterface {
  public:
   BufferedSpdyFramerVisitorInterface() {}
 
   // Called if an error is detected in the SpdySerializedFrame protocol.
   virtual void OnError(SpdyFramer::SpdyFramerError spdy_framer_error) = 0;
 
   // Called if an error is detected in a HTTP2 stream.
   virtual void OnStreamError(SpdyStreamId stream_id,
-                             const std::string& description) = 0;
+                             const SpdyString& description) = 0;
 
   // Called after all the header data for HEADERS control frame is received.
   virtual void OnHeaders(SpdyStreamId stream_id,
                          bool has_priority,
                          int weight,
                          SpdyStreamId parent_stream_id,
                          bool exclusive,
                          bool fin,
                          SpdyHeaderBlock headers) = 0;
 
@@ skipping 209 matching lines @@
     bool exclusive;
     bool fin;
     bool unidirectional;
   };
   std::unique_ptr<ControlFrameFields> control_frame_fields_;
 
   // Collection of fields of a GOAWAY frame that this class needs to buffer.
   struct GoAwayFields {
     SpdyStreamId last_accepted_stream_id;
     SpdyErrorCode error_code;
-    std::string debug_data;
+    SpdyString debug_data;
 
     // Returns the estimate of dynamically allocated memory in bytes.
     size_t EstimateMemoryUsage() const;
   };
   std::unique_ptr<GoAwayFields> goaway_fields_;
 
   std::unique_ptr<HeaderCoalescer> coalescer_;
 
   DISALLOW_COPY_AND_ASSIGN(BufferedSpdyFramer);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_BUFFERED_SPDY_FRAMER_H_