Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/first_run/first_run_browsertest.cc

Index: chrome/browser/first_run/first_run_browsertest.cc
diff --git a/chrome/browser/first_run/first_run_browsertest.cc b/chrome/browser/first_run/first_run_browsertest.cc
index c295df9b0fa16ddc4517c7bfc13bc7cdb0f50ff6..d1f65e708a5d705b46552ea3d408775b3d59fca4 100644
--- a/chrome/browser/first_run/first_run_browsertest.cc
+++ b/chrome/browser/first_run/first_run_browsertest.cc
@@ -89,8 +89,7 @@ class FirstRunMasterPrefsBrowserTestBase : public InProcessBrowserTest {
     ASSERT_TRUE(text_.get());
 
     ASSERT_TRUE(base::CreateTemporaryFile(&prefs_file_));
-    EXPECT_TRUE(file_util::WriteFile(prefs_file_, text_->c_str(),
-                                     text_->size()));
+    EXPECT_TRUE(base::WriteFile(prefs_file_, text_->c_str(), text_->size()));
     first_run::SetMasterPrefsPathForTesting(prefs_file_);
 
     // This invokes BrowserMain, and does the import, so must be done last.