win vs2015: fix variable shadowing warnings

net/base/upload_file_element_reader.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 "net/base/upload_file_element_reader.h"
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
 #include "base/profiler/scoped_tracker.h"
@@ skipping 101 matching lines @@
   DCHECK(!callback.is_null());
 
   if (result < 0) {
     DLOG(WARNING) << "Failed to open \"" << path_.value()
                   << "\" for reading: " << result;
     callback.Run(result);
     return;
   }
 
   if (range_offset_) {
-    int result = file_stream_->Seek(
+    int seek_result = file_stream_->Seek(
         base::File::FROM_BEGIN, range_offset_,
         base::Bind(&UploadFileElementReader::OnSeekCompleted,
-                   weak_ptr_factory_.GetWeakPtr(),
-                   callback));
-    DCHECK_GT(0, result);
-    if (result != ERR_IO_PENDING)
-      callback.Run(result);
+                   weak_ptr_factory_.GetWeakPtr(), callback));
+    DCHECK_GT(0, seek_result);
+    if (seek_result != ERR_IO_PENDING)
+      callback.Run(seek_result);
   } else {
     OnSeekCompleted(callback, OK);
   }
 }
 
 void UploadFileElementReader::OnSeekCompleted(
     const CompletionCallback& callback,
     int64 result) {
   DCHECK(!callback.is_null());
 
@@ skipping 72 matching lines @@
 ScopedOverridingContentLengthForTests(uint64 value) {
   overriding_content_length = value;
 }
 
 UploadFileElementReader::ScopedOverridingContentLengthForTests::
 ~ScopedOverridingContentLengthForTests() {
   overriding_content_length = 0;
 }
 
 }  // namespace net