Move some more file utils to the base namespace.

base/file_util_android.cc

Index: base/file_util_android.cc
diff --git a/base/file_util_android.cc b/base/file_util_android.cc
index 6ac9def8c1da7f0e136302f6cf112db7a5683807..def4d7cab96d914c5e1532174e86c89d67851b0d 100644
--- a/base/file_util_android.cc
+++ b/base/file_util_android.cc
@@ -7,10 +7,10 @@
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 
-namespace file_util {
+namespace base {
 
-bool GetShmemTempDir(base::FilePath* path, bool executable) {
+bool GetShmemTempDir(bool executable, base::FilePath* path) {
   return PathService::Get(base::DIR_CACHE, path);
 }
 
-}  // namespace file_util
+}  // namespace base