Move directory creation functions to base namespace.

net/disk_cache/cache_util_posix.cc

Index: net/disk_cache/cache_util_posix.cc
diff --git a/net/disk_cache/cache_util_posix.cc b/net/disk_cache/cache_util_posix.cc
index b33c560a000f3cdf7920d829361546522603448f..59e1c505d49a97c94f4f6a37dc9c48ed1eac8f3e 100644
--- a/net/disk_cache/cache_util_posix.cc
+++ b/net/disk_cache/cache_util_posix.cc
@@ -19,7 +19,7 @@ bool MoveCache(const base::FilePath& from_path, const base::FilePath& to_path) {
   // to see these directories anymore in an unmounted encrypted
   // filesystem, so we just move each item in the cache to a new
   // directory.
-  if (!file_util::CreateDirectory(to_path)) {
+  if (!base::CreateDirectory(to_path)) {
     LOG(ERROR) << "Unable to create destination cache directory.";
     return false;
   }