Remove stack trace from URLFetcher / URLRequest for debugging

net/url_request/url_fetcher_core.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_URL_REQUEST_URL_FETCHER_CORE_H_
 #define NET_URL_REQUEST_URL_FETCHER_CORE_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <set>
 #include <string>
 
 #include "base/compiler_specific.h"
-#include "base/debug/stack_trace.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/timer/timer.h"
 #include "net/base/chunked_upload_data_stream.h"
 #include "net/base/host_port_pair.h"
 #include "net/http/http_request_headers.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_request.h"
@@ skipping 314 matching lines @@
   // Timer to poll the progress of uploading for POST and PUT requests.
   // When crbug.com/119629 is fixed, scoped_ptr is not necessary here.
   std::unique_ptr<base::RepeatingTimer> upload_progress_checker_timer_;
   // Number of bytes sent so far.
   int64_t current_upload_bytes_;
   // Number of bytes received so far.
   int64_t current_response_bytes_;
   // Total expected bytes to receive (-1 if it cannot be determined).
   int64_t total_response_bytes_;
 
-  // TODO(willchan): Get rid of this after debugging crbug.com/90971.
-  base::debug::StackTrace stack_trace_;
-
   static base::LazyInstance<Registry> g_registry;
 
   DISALLOW_COPY_AND_ASSIGN(URLFetcherCore);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_FETCHER_CORE_H_