Linux sandbox: cleanup sandbox-bpf naming.

sandbox/linux/seccomp-bpf/syscall_iterator.cc

 // 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.
 
 #include "sandbox/linux/seccomp-bpf/syscall_iterator.h"
 
 #include "base/basictypes.h"
 #include "sandbox/linux/seccomp-bpf/linux_seccomp.h"
 
-namespace playground2 {
+namespace sandbox {
 
 uint32_t SyscallIterator::Next() {
   if (done_) {
     return num_;
   }
 
   uint32_t val;
   do {
     // |num_| has been initialized to 0, which we assume is also MIN_SYSCALL.
     // This true for supported architectures (Intel and ARM EABI).
@@ skipping 61 matching lines @@
 
 #if defined(__arm__) && (defined(__thumb__) || defined(__ARM_EABI__))
 bool SyscallIterator::IsArmPrivate(uint32_t num) {
   return (num >= MIN_PRIVATE_SYSCALL && num <= MAX_PRIVATE_SYSCALL) ||
          (num >= MIN_GHOST_SYSCALL && num <= MAX_SYSCALL);
 }
 #else
 bool SyscallIterator::IsArmPrivate(uint32_t) { return false; }
 #endif
 
-}  // namespace
+}  // namespace sandbox