Rewrite all BPF policies to use DSL API

sandbox/linux/seccomp-bpf-helpers/baseline_policy.h

Index: sandbox/linux/seccomp-bpf-helpers/baseline_policy.h
diff --git a/sandbox/linux/seccomp-bpf-helpers/baseline_policy.h b/sandbox/linux/seccomp-bpf-helpers/baseline_policy.h
index edf4c77b3c667f530732685009c58aa8fe564425..eb3fd0a392353d6aaec56013af92c707edd43f1a 100644
--- a/sandbox/linux/seccomp-bpf-helpers/baseline_policy.h
+++ b/sandbox/linux/seccomp-bpf-helpers/baseline_policy.h
@@ -5,6 +5,7 @@
 #ifndef SANDBOX_LINUX_SECCOMP_BPF_HELPERS_BASELINE_POLICY_H_
 #define SANDBOX_LINUX_SECCOMP_BPF_HELPERS_BASELINE_POLICY_H_
 
+#include "sandbox/linux/seccomp-bpf-helpers/bpf_dsl.h"
 #include "sandbox/linux/seccomp-bpf/errorcode.h"
 #include "sandbox/linux/seccomp-bpf/sandbox_bpf_policy.h"
 #include "sandbox/sandbox_export.h"
@@ -25,7 +26,7 @@ class SandboxBPFPolicy;
 // code in a sandboxed environment.
 // A baseline policy is only valid for the process for which this object was
 // instantiated (so do not fork() and use it in a child).
-class SANDBOX_EXPORT BaselinePolicy : public SandboxBPFPolicy {
+class SANDBOX_EXPORT BaselinePolicy : public bpf_dsl::SandboxBPFPolicyDSL {
  public:
   BaselinePolicy();
   // |fs_denied_errno| is the errno returned when a filesystem access system
@@ -33,8 +34,9 @@ class SANDBOX_EXPORT BaselinePolicy : public SandboxBPFPolicy {
   explicit BaselinePolicy(int fs_denied_errno);
   virtual ~BaselinePolicy();
 
-  virtual ErrorCode EvaluateSyscall(SandboxBPF* sandbox_compiler,
-                                    int system_call_number) const OVERRIDE;
+  using bpf_dsl::SandboxBPFPolicyDSL::EvaluateSyscall;
+  virtual bpf_dsl::ResultExpr EvaluateSyscall(
+      int system_call_number) const OVERRIDE;
 
  private:
   int fs_denied_errno_;