Factor out common error-code conversion code for PlatformFileErrorToNetError.

net/base/net_errors.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/base/net_errors.h"
 
 #include "base/basictypes.h"
 #include "base/metrics/histogram.h"
 #include "base/stringize_macros.h"
 
@@ skipping 26 matching lines @@
   default:
     return "net::<unknown>";
   }
 }
 
 std::vector<int> GetAllErrorCodesForUma() {
   return base::CustomHistogram::ArrayToCustomRanges(
       kAllErrorCodes, arraysize(kAllErrorCodes));
 }
 
+int PlatformFileErrorToNetError(
+    base::PlatformFileError file_error) {
+  switch (file_error) {
+    case base::PLATFORM_FILE_OK:
+      return net::OK;
+    case base::PLATFORM_FILE_ERROR_NOT_FOUND:
+      return net::ERR_FILE_NOT_FOUND;
+    case base::PLATFORM_FILE_ERROR_ACCESS_DENIED:
+      return net::ERR_ACCESS_DENIED;
+    default:
+      return net::ERR_FAILED;
+  }
+}
+
 }  // namespace net