Linux sandbox: cleanup sandbox-bpf naming.

sandbox/linux/seccomp-bpf/die.h

Index: sandbox/linux/seccomp-bpf/die.h
diff --git a/sandbox/linux/seccomp-bpf/die.h b/sandbox/linux/seccomp-bpf/die.h
index 2ed3f07f1a9433d23f2b4bdc016b55e8cdf7f836..a593f25d067917f7052a5d9e5a1d5997e8e28456 100644
--- a/sandbox/linux/seccomp-bpf/die.h
+++ b/sandbox/linux/seccomp-bpf/die.h
@@ -7,18 +7,18 @@
 
 #include "base/basictypes.h"
 
-namespace playground2 {
+namespace sandbox {
 
 // This is the main API for using this file. Prints a error message and
 // exits with a fatal error. This is not async-signal safe.
-#define SANDBOX_DIE(m) playground2::Die::SandboxDie(m, __FILE__, __LINE__)
+#define SANDBOX_DIE(m) sandbox::Die::SandboxDie(m, __FILE__, __LINE__)
 
 // An async signal safe version of the same API. Won't print the filename
 // and line numbers.
-#define RAW_SANDBOX_DIE(m) playground2::Die::RawSandboxDie(m)
+#define RAW_SANDBOX_DIE(m) sandbox::Die::RawSandboxDie(m)
 
 // Adds an informational message to the log file or stderr as appropriate.
-#define SANDBOX_INFO(m) playground2::Die::SandboxInfo(m, __FILE__, __LINE__)
+#define SANDBOX_INFO(m) sandbox::Die::SandboxInfo(m, __FILE__, __LINE__)
 
 class Die {
  public: