Begin the first small step towards using FilePath everywhere:

chrome/browser/download/save_page_uitest.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 "base/path_service.h"
 #include "base/string_util.h"
 #include "chrome/browser/automation/url_request_mock_http_job.h"
 #include "chrome/browser/download/save_package.h"
 #include "chrome/common/chrome_paths.h"
@@ skipping 25 matching lines @@
       ASSERT_TRUE(PathService::Get(chrome::DIR_TEST_DATA,
                                    &server_file_name));
       server_file_name += L"\\" + kTestDir + L"\\" + server_file;
       ASSERT_TRUE(file_util::PathExists(server_file_name));
 
       int64 client_file_size = 0;
       int64 server_file_size = 0;
       EXPECT_TRUE(file_util::GetFileSize(client_file, &client_file_size));
       EXPECT_TRUE(file_util::GetFileSize(server_file_name, &server_file_size));
       EXPECT_EQ(client_file_size, server_file_size);
-      EXPECT_PRED2(file_util::ContentsEqual, client_file, server_file_name);
+      EXPECT_TRUE(file_util::ContentsEqual(client_file, server_file_name));
     }
 
     EXPECT_TRUE(DieFileDie(client_file, false));
   }
 
   virtual void SetUp() {
     UITest::SetUp();
     EXPECT_TRUE(file_util::CreateNewTempDirectory(L"", &save_dir_));
     save_dir_ += file_util::kPathSeparator;
   }
@@ skipping 46 matching lines @@
 
   scoped_ptr<TabProxy> tab(GetActiveTab());
   ASSERT_TRUE(tab->NavigateToURL(GURL(L"about:blank")));
   WaitUntilTabCount(1);
 
   EXPECT_FALSE(tab->SavePage(full_file_name, dir,
       SavePackage::SAVE_AS_ONLY_HTML));
   EXPECT_FALSE(WaitForDownloadShelfVisible(tab.get()));
 }