Update from https://crrev.com/305340

net/tools/dump_cache/cache_dumper.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/tools/dump_cache/cache_dumper.h"
 
 #include "base/files/file_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
@@ skipping 27 matching lines @@
     entry->Close();
   }
 }
 
 // A version of CreateDirectory which supports lengthy filenames.
 // Returns true on success, false on failure.
 bool SafeCreateDirectory(const base::FilePath& path) {
 #ifdef WIN32_LARGE_FILENAME_SUPPORT
   // Due to large paths on windows, it can't simply do a
   // CreateDirectory("a/b/c").  Instead, create each subdirectory manually.
-  bool rv = false;
   std::wstring::size_type pos(0);
   std::wstring backslash(L"\\");
 
   // If the path starts with the long file header, skip over that
   const std::wstring kLargeFilenamePrefix(L"\\\\?\\");
   std::wstring header(kLargeFilenamePrefix);
   if (path.value().find(header) == 0)
     pos = 4;
 
   // Create the subdirectories individually
@@ skipping 155 matching lines @@
 }
 
 void DiskDumper::CloseEntry(disk_cache::Entry* entry, base::Time last_used,
                           base::Time last_modified) {
 #ifdef WIN32_LARGE_FILENAME_SUPPORT
   CloseHandle(entry_);
 #else
   base::CloseFile(entry_);
 #endif
 }