Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/installer/util/install_util_unittest.cc

 // Copyright (c) 2012 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 <string>
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/strings/string_util.h"
@@ skipping 399 matching lines @@
   // Paths match exactly.
   EXPECT_TRUE(InstallUtil::ProgramCompare(expect).Evaluate(
       L"\"" + expect.value() + L"\""));
   // Paths differ by case.
   EXPECT_TRUE(InstallUtil::ProgramCompare(expect).Evaluate(
       L"\"" + expect_upcase.value() + L"\""));
 
   // Tests where the expected file exists.
   static const char data[] = "data";
   ASSERT_TRUE(base::CreateDirectory(some_long_dir));
-  ASSERT_NE(-1, file_util::WriteFile(expect, data, arraysize(data) - 1));
+  ASSERT_NE(-1, base::WriteFile(expect, data, arraysize(data) - 1));
   // Paths don't match.
   EXPECT_FALSE(InstallUtil::ProgramCompare(expect).Evaluate(
       L"\"" + other.value() + L"\""));
   // Paths match exactly.
   EXPECT_TRUE(InstallUtil::ProgramCompare(expect).Evaluate(
       L"\"" + expect.value() + L"\""));
   // Paths differ by case.
   EXPECT_TRUE(InstallUtil::ProgramCompare(expect).Evaluate(
       L"\"" + expect_upcase.value() + L"\""));
 
   // Test where strings don't match, but the same file is indicated.
   std::wstring short_expect;
   DWORD short_len = GetShortPathName(expect.value().c_str(),
                                      WriteInto(&short_expect, MAX_PATH),
                                      MAX_PATH);
   ASSERT_NE(static_cast<DWORD>(0), short_len);
   ASSERT_GT(static_cast<DWORD>(MAX_PATH), short_len);
   short_expect.resize(short_len);
   ASSERT_FALSE(base::FilePath::CompareEqualIgnoreCase(expect.value(),
                                                       short_expect));
   EXPECT_TRUE(InstallUtil::ProgramCompare(expect).Evaluate(
       L"\"" + short_expect + L"\""));
 }