Linux sandbox: cleanup sandbox-bpf naming.

sandbox/linux/seccomp-bpf/codegen_unittest.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 <errno.h>
 
 #include <algorithm>
 #include <set>
 #include <vector>
 
 #include "sandbox/linux/seccomp-bpf/codegen.h"
 #include "sandbox/linux/seccomp-bpf/sandbox_bpf.h"
 #include "sandbox/linux/tests/unit_tests.h"
 
-namespace playground2 {
+namespace sandbox {
 
-class SandboxUnittestHelper : public Sandbox {
+class SandboxUnittestHelper : public SandboxBPF {
  public:
-  typedef Sandbox::Program Program;
+  typedef SandboxBPF::Program Program;
 };
 
 // We want to access some of the private methods in the code generator. We
 // do so by defining a "friend" that makes these methods public for us.
 class CodeGenUnittestHelper : public CodeGen {
  public:
   void FindBranchTargets(const Instruction& instructions,
                          BranchTargets *branch_targets) {
     CodeGen::FindBranchTargets(instructions, branch_targets);
   }
@@ skipping 407 matching lines @@
     assembly.append(reinterpret_cast<char *>(&insn.code), sizeof(insn.code));
     assembly.append(reinterpret_cast<char *>(&insn.k),    sizeof(insn.k));
   }
   SANDBOX_ASSERT(source == assembly);
 }
 
 SANDBOX_TEST(CodeGen, All) {
   ForAllPrograms(CompileAndCompare);
 }
 
-}  // namespace playground2
+}  // namespace sandbox