Linux sandbox: cleanup sandbox-bpf naming.

sandbox/linux/seccomp-bpf/verifier.h

Index: sandbox/linux/seccomp-bpf/verifier.h
diff --git a/sandbox/linux/seccomp-bpf/verifier.h b/sandbox/linux/seccomp-bpf/verifier.h
index fff5b6339ea7e758b8b0bc80e85cc8125d333d21..ca5fd6094c002dfad6e128c24f0217c8ac5e67fc 100644
--- a/sandbox/linux/seccomp-bpf/verifier.h
+++ b/sandbox/linux/seccomp-bpf/verifier.h
@@ -10,7 +10,7 @@
 #include <utility>
 #include <vector>
 
-namespace playground2 {
+namespace sandbox {
 
 class SandboxBpfPolicy;
 
@@ -23,7 +23,7 @@ class Verifier {
   // set by the "evaluators".
   // Upon success, "err" is set to NULL. Upon failure, it contains a static
   // error message that does not need to be free()'d.
-  static bool VerifyBPF(Sandbox* sandbox,
+  static bool VerifyBPF(SandboxBPF* sandbox,
                         const std::vector<struct sock_filter>& program,
                         const SandboxBpfPolicy& policy,
                         const char** err);