Replace the existing SpdyHeaderBlock typedef with a class.

content/browser/devtools/devtools_netlog_observer.cc

 // 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.
 
 #include "content/browser/devtools/devtools_netlog_observer.h"
 
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "content/browser/loader/resource_request_info_impl.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 94 matching lines @@
                                                &request_headers)) {
         NOTREACHED();
       }
 
       // We need to clear headers in case the same url_request is reused for
       // several http requests (e.g. see http://crbug.com/80157).
       info->request_headers.clear();
 
       for (net::SpdyHeaderBlock::const_iterator it = request_headers.begin();
            it != request_headers.end(); ++it) {
-        info->request_headers.push_back(std::make_pair(it->first, it->second));
+        info->request_headers.push_back(
+            std::make_pair(it->first.as_string(), it->second.as_string()));
       }
       info->request_headers_text = "";
       break;
     }
     case net::NetLog::TYPE_HTTP_TRANSACTION_READ_RESPONSE_HEADERS: {
       scoped_ptr<base::Value> event_params(entry.ParametersToValue());
 
       scoped_refptr<net::HttpResponseHeaders> response_headers;
 
       if (!net::HttpResponseHeaders::FromNetLogParam(event_params.get(),
@@ skipping 69 matching lines @@
   uint32 source_id = request->net_log().source().id;
   DevToolsNetLogObserver* dev_tools_net_log_observer =
       DevToolsNetLogObserver::GetInstance();
   if (dev_tools_net_log_observer == NULL)
     return;
   response->head.devtools_info =
       dev_tools_net_log_observer->GetResourceInfo(source_id);
 }
 
 }  // namespace content