Step 2 in porting disk cache to using FilePath.

net/disk_cache/block_files_unittest.cc

 // Copyright (c) 2006-2008 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 "base/file_util.h"
 #include "net/disk_cache/block_files.h"
 #include "net/disk_cache/disk_cache.h"
 #include "net/disk_cache/disk_cache_test_base.h"
 #include "net/disk_cache/disk_cache_test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 152 matching lines @@
   ASSERT_TRUE(file_util::CreateDirectory(path));
 
   BlockFiles files(path);
   ASSERT_TRUE(files.Init(true));
 
   std::wstring filename = files.Name(0);
   files.CloseFiles();
   // Truncate one of the files.
   {
     scoped_refptr<File> file(new File);
-    ASSERT_TRUE(file->Init(filename));
+    ASSERT_TRUE(file->Init(FilePath::FromWStringHack(filename)));
     EXPECT_TRUE(file->SetLength(0));
   }
 
   // Initializing should fail, not crash.
   ASSERT_FALSE(files.Init(false));
 }
 
 // An invalid file can be detected after init.
 TEST_F(DiskCacheTest, BlockFiles_InvalidFile) {
   std::wstring path = GetCachePath();
@@ skipping 14 matching lines @@
   EXPECT_EQ(kBlockHeaderSize,
             file_util::WriteFile(filename, header, kBlockHeaderSize));
 
   EXPECT_TRUE(NULL == files.GetFile(addr));
 
   // The file should not have been cached (it is still invalid).
   EXPECT_TRUE(NULL == files.GetFile(addr));
 }
 
 }  // namespace disk_cache