Move WriteFile and WriteFileDescriptor from file_util to base namespace.

net/url_request/url_fetcher_impl_unittest.cc

Index: net/url_request/url_fetcher_impl_unittest.cc
diff --git a/net/url_request/url_fetcher_impl_unittest.cc b/net/url_request/url_fetcher_impl_unittest.cc
index c96993f89a4cffaaaa8e2eeb64daa0dab590f88e..39e2bb286a9d434c9347422c520a006e16688422 100644
--- a/net/url_request/url_fetcher_impl_unittest.cc
+++ b/net/url_request/url_fetcher_impl_unittest.cc
@@ -1433,7 +1433,7 @@ TEST_F(URLFetcherFileTest, OverwriteExistingFile) {
   std::string data(10000, '?');  // Meant to be larger than simple.html.
   file_path_ = temp_dir.path().AppendASCII(kFileToFetch);
   ASSERT_EQ(static_cast<int>(data.size()),
-            file_util::WriteFile(file_path_, data.data(), data.size()));
+            base::WriteFile(file_path_, data.data(), data.size()));
   ASSERT_TRUE(base::PathExists(file_path_));
   expected_file_ = test_server.GetDocumentRoot().AppendASCII(kFileToFetch);
   ASSERT_FALSE(base::ContentsEqual(file_path_, expected_file_));