Linux sandbox: cleanup sandbox-bpf naming.

sandbox/linux/seccomp-bpf/syscall_iterator.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_ITERATOR_H__
 #define SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_ITERATOR_H__
 
 #include <stdint.h>
 
 #include "base/basictypes.h"
 
-namespace playground2 {
+namespace sandbox {
 
 // Iterates over the entire system call range from 0..0xFFFFFFFFu. This
 // iterator is aware of how system calls look like and will skip quickly
 // over ranges that can't contain system calls. It iterates more slowly
 // whenever it reaches a range that is potentially problematic, returning
 // the last invalid value before a valid range of system calls, and the
 // first invalid value after a valid range of syscalls. It iterates over
 // individual values whenever it is in the normal range for system calls
 // (typically MIN_SYSCALL..MAX_SYSCALL).
 // If |invalid_only| is true, this iterator will only return invalid
@@ skipping 20 matching lines @@
  private:
   static bool IsArmPrivate(uint32_t num);
 
   bool invalid_only_;
   bool done_;
   uint32_t num_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(SyscallIterator);
 };
 
-}  // namespace playground2
+}  // namespace sandbox
 
 #endif  // SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_ITERATOR_H__