FilePath: Remove most of ToWStringHack, adding a LossyDisplayName()

base/file_util_unittest.cc

 // Copyright (c) 2011 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 "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <winioctl.h>
 #include <shellapi.h>
@@ skipping 145 matching lines @@
   }
 
  private:
   std::set<FilePath::StringType> files_;
 };
 
 // Simple function to dump some text into a new file.
 void CreateTextFile(const FilePath& filename,
                     const std::wstring& contents) {
   std::ofstream file;
-  file.open(WideToUTF8(filename.ToWStringHack()).c_str());
+  file.open(filename.value().c_str());
   ASSERT_TRUE(file.is_open());
   file << contents;
   file.close();
 }
 
 // Simple function to take out some text from a file.
 std::wstring ReadTextFile(const FilePath& filename) {
   wchar_t contents[64];
   std::wifstream file;
-  file.open(WideToUTF8(filename.ToWStringHack()).c_str());
+  file.open(filename.value().c_str());
   EXPECT_TRUE(file.is_open());
   file.getline(contents, 64);
   file.close();
   return std::wstring(contents);
 }
 
 #if defined(OS_WIN)
 uint64 FileTimeAsUint64(const FILETIME& ft) {
   ULARGE_INTEGER u;
   u.LowPart = ft.dwLowDateTime;
@@ skipping 1620 matching lines @@
   EXPECT_TRUE(file_util::IsDirectoryEmpty(empty_dir));
 
   FilePath foo(empty_dir.Append(FILE_PATH_LITERAL("foo.txt")));
   std::string bar("baz");
   ASSERT_TRUE(file_util::WriteFile(foo, bar.c_str(), bar.length()));
 
   EXPECT_FALSE(file_util::IsDirectoryEmpty(empty_dir));
 }
 
 }  // namespace