Update from https://crrev.com/316786

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 51 matching lines @@
     pos++;
   }
   // Now create the full path
   return CreateDirectoryW(path.value().c_str(), NULL) == TRUE;
 #else
   return base::CreateDirectory(path);
 #endif
 }
 
 DiskDumper::DiskDumper(const base::FilePath& path)
-    : path_(path), entry_(NULL) {
+    : path_(path.AsEndingWithSeparator()), entry_(NULL) {
   base::CreateDirectory(path);
 }
 
 int DiskDumper::CreateEntry(const std::string& key,
                             disk_cache::Entry** entry,
                             const net::CompletionCallback& callback) {
   // The URL may not start with a valid protocol; search for it.
   int urlpos = key.find("http");
   std::string url = urlpos > 0 ? key.substr(urlpos) : key;
   std::string base_path = path_.MaybeAsASCII();
@@ skipping 130 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
 }