Change FileStream to use FilePath instead of wstring.

net/base/file_stream_unittest.cc

 // Copyright (c) 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 "base/path_service.h"
 #include "net/base/file_stream.h"
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
 static const char kTestData[] = "0123456789";
 static const int kTestDataSize = arraysize(kTestData) - 1;
 
 class FileStreamTest : public PlatformTest {
  public:
   virtual void SetUp() {
     PlatformTest::SetUp();
 
     file_util::CreateTemporaryFileName(&temp_file_path_);
-    file_util::WriteFile(temp_file_path_, kTestData, kTestDataSize);
+    file_util::WriteFile(temp_file_path_.ToWStringHack(),
+                         kTestData, kTestDataSize);
   }
   virtual void TearDown() {
     file_util::Delete(temp_file_path_, false);
 
     PlatformTest::TearDown();
   }
-  const std::wstring temp_file_path() const { return temp_file_path_; }
+  const FilePath temp_file_path() const { return temp_file_path_; }
  private:
-  std::wstring temp_file_path_;
+  FilePath temp_file_path_;
 };
 
 TEST_F(FileStreamTest, BasicOpenClose) {
   net::FileStream stream;
   int rv = stream.Open(temp_file_path(), 
       base::PLATFORM_FILE_OPEN | base::PLATFORM_FILE_READ);
   EXPECT_EQ(net::OK, rv);
 }
 
 TEST_F(FileStreamTest, UseClosedStream) {
@@ skipping 318 matching lines @@
   rv = stream.Write(kTestData, kTestDataSize, NULL);
   EXPECT_EQ(kTestDataSize, rv);
   stream.Close();
 
   ok = file_util::GetFileSize(temp_file_path(), &file_size);
   EXPECT_TRUE(ok);
   EXPECT_EQ(kTestDataSize * 2, file_size);
 }
 
 // TODO(erikkay): more READ_WRITE tests?