Move WriteFile and WriteFileDescriptor from file_util to base namespace.

content/browser/fileapi/obfuscated_file_util_unittest.cc

Index: content/browser/fileapi/obfuscated_file_util_unittest.cc
diff --git a/content/browser/fileapi/obfuscated_file_util_unittest.cc b/content/browser/fileapi/obfuscated_file_util_unittest.cc
index e338652d698ecb9f290e329d25a4968d83cc4911..29fce2f551b13e305535e545dd595ae8378b3c58 100644
--- a/content/browser/fileapi/obfuscated_file_util_unittest.cc
+++ b/content/browser/fileapi/obfuscated_file_util_unittest.cc
@@ -764,9 +764,9 @@ class ObfuscatedFileUtilTest : public testing::Test {
       old_directory_db_path = data_dir_path().Append(path);
       ASSERT_TRUE(base::CreateDirectory(old_directory_db_path));
       EXPECT_EQ(static_cast<int>(kFakeDirectoryData.size()),
-                file_util::WriteFile(old_directory_db_path.AppendASCII("dummy"),
-                                     kFakeDirectoryData.data(),
-                                     kFakeDirectoryData.size()));
+                base::WriteFile(old_directory_db_path.AppendASCII("dummy"),
+                                kFakeDirectoryData.data(),
+                                kFakeDirectoryData.size()));
     }
 
     storage_policy_->AddIsolated(origin_);