Linux sandbox: cleanup sandbox-bpf naming.

sandbox/linux/seccomp-bpf/sandbox_bpf_policy.h

Index: sandbox/linux/seccomp-bpf/sandbox_bpf_policy.h
diff --git a/sandbox/linux/seccomp-bpf/sandbox_bpf_policy.h b/sandbox/linux/seccomp-bpf/sandbox_bpf_policy.h
index 99d9e1939a3614e8b58e3f5020c7d60ef3e43042..69452488fa879f38165a7822636f7bd90af729df 100644
--- a/sandbox/linux/seccomp-bpf/sandbox_bpf_policy.h
+++ b/sandbox/linux/seccomp-bpf/sandbox_bpf_policy.h
@@ -7,10 +7,10 @@
 
 #include "base/basictypes.h"
 
-namespace playground2 {
+namespace sandbox {
 
 class ErrorCode;
-class Sandbox;
+class SandboxBPF;
 
 // This is the interface to implement to define a BPF sandbox policy.
 class SandboxBpfPolicy {
@@ -23,13 +23,13 @@ class SandboxBpfPolicy {
   // it can deny the system call unconditionally by returning an appropriate
   // "errno" value; or it can request inspection of system call argument(s) by
   // returning a suitable ErrorCode.
-  virtual ErrorCode EvaluateSyscall(Sandbox* sandbox_compiler,
+  virtual ErrorCode EvaluateSyscall(SandboxBPF* sandbox_compiler,
                                     int system_call_number) const = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SandboxBpfPolicy);
 };
 
-}  // namespace playground2
+}  // namespace sandbox
 
 #endif  // SANDBOX_LINUX_SECCOMP_BPF_SANDBOX_BPF_POLICY_H_