Start migrating the disk cache to using FilePath.

net/disk_cache/disk_cache_test_util.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/disk_cache_test_util.h"
 
 #include "base/logging.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "net/base/net_errors.h"
@@ skipping 60 matching lines @@
   file->SetLength(4 * 1024 * 1024);
   return true;
 }
 
 bool DeleteCache(const wchar_t* path) {
   disk_cache::DeleteCache(path, false);
   return true;
 }
 
 bool CheckCacheIntegrity(const std::wstring& path, bool new_eviction) {
-  scoped_ptr<disk_cache::BackendImpl> cache(new disk_cache::BackendImpl(path));
+  scoped_ptr<disk_cache::BackendImpl> cache(new disk_cache::BackendImpl(
+      FilePath::FromWStringHack(path)));
   if (!cache.get())
     return false;
   if (new_eviction)
     cache->SetNewEviction();
   cache->SetFlags(disk_cache::kNoRandom);
   if (!cache->Init())
     return false;
   return cache->SelfCheck() >= 0;
 }
 
@@ skipping 71 matching lines @@
   } else {
     // Not finished yet. See if we have to abort.
     if (last_ == g_cache_tests_received)
       num_iterations_++;
     else
       last_ = g_cache_tests_received;
     if (40 == num_iterations_)
       MessageLoop::current()->Quit();
   }
 }