Move directory creation functions to base namespace.

base/base_paths_mac.mm

Index: base/base_paths_mac.mm
diff --git a/base/base_paths_mac.mm b/base/base_paths_mac.mm
index 5d4461cb236c65b9ee9e3e3cb3c25adb5de16bf7..86d6a80e9add8b4c61f5fb7a35d11f66e8197b40 100644
--- a/base/base_paths_mac.mm
+++ b/base/base_paths_mac.mm
@@ -71,7 +71,7 @@ bool PathProviderMac(int key, base::FilePath* result) {
 #if defined(OS_IOS)
       // On IOS, this directory does not exist unless it is created explicitly.
       if (success && !base::PathExists(*result))
-        success = file_util::CreateDirectory(*result);
+        success = base::CreateDirectory(*result);
 #endif  // defined(OS_IOS)
       return success;
     }