Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/installer/util/install_util_unittest.cc

Index: chrome/installer/util/install_util_unittest.cc
diff --git a/chrome/installer/util/install_util_unittest.cc b/chrome/installer/util/install_util_unittest.cc
index 9d37df50fd76e1e251d9ec23c90825e1f003468c..f1234b8c10e7f72a2a875a2c98ae71cd5600b195 100644
--- a/chrome/installer/util/install_util_unittest.cc
+++ b/chrome/installer/util/install_util_unittest.cc
@@ -417,7 +417,7 @@ TEST_F(InstallUtilTest, ProgramCompare) {
   // 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"\""));