NaCl Linux: create NaClSandbox class

components/nacl/loader/sandbox_linux/nacl_bpf_sandbox_linux.cc

Index: components/nacl/loader/sandbox_linux/nacl_bpf_sandbox_linux.cc
diff --git a/components/nacl/loader/nacl_sandbox_linux.cc b/components/nacl/loader/sandbox_linux/nacl_bpf_sandbox_linux.cc
similarity index 97%
rename from components/nacl/loader/nacl_sandbox_linux.cc
rename to components/nacl/loader/sandbox_linux/nacl_bpf_sandbox_linux.cc
index f1e4a49a4f71b1ab1efaaade862ea8a9d9f399b2..e123523de2b0b0444abeceaa83bfb326e1b7aa5d 100644
--- a/components/nacl/loader/nacl_sandbox_linux.cc
+++ b/components/nacl/loader/sandbox_linux/nacl_bpf_sandbox_linux.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/nacl/loader/nacl_sandbox_linux.h"
+#include "components/nacl/loader/sandbox_linux/nacl_bpf_sandbox_linux.h"
 
 #include <errno.h>
 #include <signal.h>
@@ -24,6 +24,8 @@ using sandbox::ErrorCode;
 using sandbox::SandboxBPF;
 using sandbox::SandboxBPFPolicy;
 
+namespace nacl {
+
 namespace {
 
 // On ARM and x86_64, System V shared memory calls have each their own system
@@ -172,3 +174,5 @@ bool InitializeBPFSandbox() {
 #endif  // defined(USE_SECCOMP_BPF)
   return false;
 }
+
+}  // namespace nacl