Refactor FtpCtrlResponseBuffer::ParseLine to use net::ParseInt32() rather than base::StringToInt().

net/ftp/ftp_ctrl_response_buffer.cc

 // Copyright (c) 2011 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 "net/ftp/ftp_ctrl_response_buffer.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/logging.h"
-#include "base/strings/string_number_conversions.h"
+#include "net/base/parse_number.h"
 #include "base/strings/string_piece.h"
 #include "base/values.h"
 #include "net/base/net_errors.h"
 
 namespace net {
 
 // static
 const int FtpCtrlResponse::kInvalidStatusCode = -1;
 
 FtpCtrlResponse::FtpCtrlResponse() : status_code(kInvalidStatusCode) {}
@@ skipping 94 matching lines @@
 
 FtpCtrlResponseBuffer::ParsedLine::ParsedLine(const ParsedLine& other) =
     default;
 
 // static
 FtpCtrlResponseBuffer::ParsedLine FtpCtrlResponseBuffer::ParseLine(
     const std::string& line) {
   ParsedLine result;
 
   if (line.length() >= 3) {
-    if (base::StringToInt(base::StringPiece(line.begin(), line.begin() + 3),
-                          &result.status_code))
-      result.has_status_code = (100 <= result.status_code &&
-                                result.status_code <= 599);
+    if (ParseInt32(base::StringPiece(line.begin(), line.begin() + 3),
+                   ParseIntFormat::NON_NEGATIVE, &result.status_code)) {
+      result.has_status_code =
+          (100 <= result.status_code && result.status_code <= 599);
+    }
     if (result.has_status_code && line.length() >= 4 && line[3] == ' ') {
       result.is_complete = true;
     } else if (result.has_status_code && line.length() >= 4 && line[3] == '-') {
       result.is_complete = true;
       result.is_multiline = true;
     }
   }
 
   if (result.is_complete) {
     result.status_text = line.substr(4);
@@ skipping 11 matching lines @@
   for (size_t i = 0; i < buffer_.length(); i++) {
     if (i >= 1 && buffer_[i - 1] == '\r' && buffer_[i] == '\n') {
       lines_.push(ParseLine(buffer_.substr(cut_pos, i - cut_pos - 1)));
       cut_pos = i + 1;
     }
   }
   buffer_.erase(0, cut_pos);
 }
 
 }  // namespace net