Move more file_util functions to base namespace.

base/memory/shared_memory_posix.cc

Index: base/memory/shared_memory_posix.cc
diff --git a/base/memory/shared_memory_posix.cc b/base/memory/shared_memory_posix.cc
index 46202471c61a8588e83b6328b53a514857db7da4..35d8c7d35dfcd321d213e5fea592cd4f482942e1 100644
--- a/base/memory/shared_memory_posix.cc
+++ b/base/memory/shared_memory_posix.cc
@@ -264,7 +264,7 @@ bool SharedMemory::Open(const std::string& name, bool read_only) {
   read_only_ = read_only;
 
   const char *mode = read_only ? "r" : "r+";
-  ScopedFILE fp(file_util::OpenFile(path, mode));
+  ScopedFILE fp(base::OpenFile(path, mode));
   int readonly_fd_storage = -1;
   ScopedFD readonly_fd(&readonly_fd_storage);
   *readonly_fd = HANDLE_EINTR(open(path.value().c_str(), O_RDONLY));