Move Copy* into the base namespace.

chrome/browser/prefs/pref_service_browsertest.cc

Index: chrome/browser/prefs/pref_service_browsertest.cc
diff --git a/chrome/browser/prefs/pref_service_browsertest.cc b/chrome/browser/prefs/pref_service_browsertest.cc
index 3b6f712e58d08cc4f3b2eab1957dda7c12800531..c2bcf0f9ceadb0603fab60915187aa780adad1de 100644
--- a/chrome/browser/prefs/pref_service_browsertest.cc
+++ b/chrome/browser/prefs/pref_service_browsertest.cc
@@ -80,7 +80,7 @@ class PreferenceServiceTest : public InProcessBrowserTest {
     CHECK(file_util::PathExists(reference_pref_file));
     // Copy only the Preferences file if |new_profile_|, or Local State if not,
     // and the rest will be automatically created.
-    CHECK(file_util::CopyFile(reference_pref_file, tmp_pref_file_));
+    CHECK(base::CopyFile(reference_pref_file, tmp_pref_file_));
 
 #if defined(OS_WIN)
     // Make the copy writable.  On POSIX we assume the umask allows files