Move Copy* into the base namespace.

base/file_util_mac.mm

Index: base/file_util_mac.mm
diff --git a/base/file_util_mac.mm b/base/file_util_mac.mm
index 33ddb421bb98ce58c1605a64b26bc6a440311bfe..9d9ac3d99b42da1ef98868a85cff6f270c935041 100644
--- a/base/file_util_mac.mm
+++ b/base/file_util_mac.mm
@@ -13,6 +13,18 @@
 #include "base/strings/string_util.h"
 #include "base/threading/thread_restrictions.h"
 
+namespace base {
+namespace internal {
+
+bool CopyFileUnsafe(const FilePath& from_path, const FilePath& to_path) {
+  ThreadRestrictions::AssertIOAllowed();
+  return (copyfile(from_path.value().c_str(),
+                   to_path.value().c_str(), NULL, COPYFILE_ALL) == 0);
+}
+
+}  // namespace internal
+}  // namepsace base
+
 namespace file_util {
 
 bool GetTempDir(base::FilePath* path) {
@@ -27,11 +39,4 @@ bool GetShmemTempDir(base::FilePath* path, bool executable) {
   return GetTempDir(path);
 }
 
-bool CopyFileUnsafe(const base::FilePath& from_path,
-                    const base::FilePath& to_path) {
-  base::ThreadRestrictions::AssertIOAllowed();
-  return (copyfile(from_path.value().c_str(),
-                   to_path.value().c_str(), NULL, COPYFILE_ALL) == 0);
-}
-
 }  // namespace