Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/common/importer/firefox_importer_utils_unittest.cc

Index: chrome/common/importer/firefox_importer_utils_unittest.cc
diff --git a/chrome/common/importer/firefox_importer_utils_unittest.cc b/chrome/common/importer/firefox_importer_utils_unittest.cc
index 7d3468d0ef43db519c4a858d8a11a3f52c9ccf2f..987b0e955faffb5066ac290f318c3ae7d8db3495 100644
--- a/chrome/common/importer/firefox_importer_utils_unittest.cc
+++ b/chrome/common/importer/firefox_importer_utils_unittest.cc
@@ -107,9 +107,9 @@ TEST(FirefoxImporterUtilsTest, GetFirefoxImporterName) {
   const base::FilePath app_ini_file(
       temp_dir.path().AppendASCII("application.ini"));
   for (size_t i = 0; i < arraysize(GetFirefoxImporterNameCases); ++i) {
-    file_util::WriteFile(app_ini_file,
-                         GetFirefoxImporterNameCases[i].app_ini_content.c_str(),
-                         GetFirefoxImporterNameCases[i].app_ini_content.size());
+    base::WriteFile(app_ini_file,
+                    GetFirefoxImporterNameCases[i].app_ini_content.c_str(),
+                    GetFirefoxImporterNameCases[i].app_ini_content.size());
     EXPECT_EQ(GetFirefoxImporterName(temp_dir.path()),
         l10n_util::GetStringUTF16(GetFirefoxImporterNameCases[i].resource_id));
   }