Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/extensions/user_script_master_unittest.cc

Index: chrome/browser/extensions/user_script_master_unittest.cc
diff --git a/chrome/browser/extensions/user_script_master_unittest.cc b/chrome/browser/extensions/user_script_master_unittest.cc
index 585edd74fd4fc202b925753639a2e9bf99797ba2..8347cbe5e48c14d8eea63ccb98d228144bb5c816 100644
--- a/chrome/browser/extensions/user_script_master_unittest.cc
+++ b/chrome/browser/extensions/user_script_master_unittest.cc
@@ -232,7 +232,7 @@ TEST_F(UserScriptMasterTest, Parse8) {
 TEST_F(UserScriptMasterTest, SkipBOMAtTheBeginning) {
   base::FilePath path = temp_dir_.path().AppendASCII("script.user.js");
   const std::string content("\xEF\xBB\xBF alert('hello');");
-  size_t written = file_util::WriteFile(path, content.c_str(), content.size());
+  size_t written = base::WriteFile(path, content.c_str(), content.size());
   ASSERT_EQ(written, content.size());
 
   UserScript user_script;
@@ -255,7 +255,7 @@ TEST_F(UserScriptMasterTest, SkipBOMAtTheBeginning) {
 TEST_F(UserScriptMasterTest, LeaveBOMNotAtTheBeginning) {
   base::FilePath path = temp_dir_.path().AppendASCII("script.user.js");
   const std::string content("alert('here's a BOOM: \xEF\xBB\xBF');");
-  size_t written = file_util::WriteFile(path, content.c_str(), content.size());
+  size_t written = base::WriteFile(path, content.c_str(), content.size());
   ASSERT_EQ(written, content.size());
 
   UserScript user_script;