Step 2 in porting disk cache to using FilePath.

net/disk_cache/entry_impl.cc

 // Copyright (c) 2006-2009 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/disk_cache/entry_impl.h"
 
 #include "base/histogram.h"
 #include "base/message_loop.h"
 #include "base/string_util.h"
 #include "net/base/io_buffer.h"
@@ skipping 674 matching lines @@
   else
     file = backend_->File(address);
   return file;
 }
 
 File* EntryImpl::GetExternalFile(Addr address, int index) {
   DCHECK(index >= 0 && index <= kKeyFileIndex);
   if (!files_[index].get()) {
     // For a key file, use mixed mode IO.
     scoped_refptr<File> file(new File(kKeyFileIndex == index));
-    if (file->Init(backend_->GetFileName(address).ToWStringHack()))
+    if (file->Init(backend_->GetFileName(address)))
       files_[index].swap(file);
   }
   return files_[index].get();
 }
 
 bool EntryImpl::PrepareTarget(int index, int offset, int buf_len,
                               bool truncate) {
   Addr address(entry_.Data()->data_addr[index]);
 
   if (address.is_initialized() || user_buffers_[index].get())
@@ skipping 212 matching lines @@
   Trace("%s 0x%p 0x%x 0x%x", msg, reinterpret_cast<void*>(this),
         entry_.address().value(), node_.address().value());
 
   Trace("  data: 0x%x 0x%x 0x%x", entry_.Data()->data_addr[0],
         entry_.Data()->data_addr[1], entry_.Data()->long_key);
 
   Trace("  doomed: %d 0x%x", doomed_, dirty);
 }
 
 }  // namespace disk_cache