sandbox/linux: move ErrorCode into bpf_dsl

sandbox/linux/bpf_dsl/bpf_dsl_impl.h

 // Copyright 2014 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.
 
 #ifndef SANDBOX_LINUX_BPF_DSL_BPF_DSL_IMPL_H_
 #define SANDBOX_LINUX_BPF_DSL_BPF_DSL_IMPL_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "sandbox/sandbox_export.h"
 
 namespace sandbox {
+namespace bpf_dsl {
 class ErrorCode;
-
-namespace bpf_dsl {
 class PolicyCompiler;
 
 namespace internal {
 
 // Internal interface implemented by BoolExpr implementations.
 class BoolExprImpl : public base::RefCounted<BoolExprImpl> {
  public:
   // Compile uses |pc| to construct an ErrorCode that conditionally continues
   // to either |true_ec| or |false_ec|, depending on whether the represented
   // boolean expression is true or false.
@@ skipping 34 matching lines @@
  private:
   friend class base::RefCounted<ResultExprImpl>;
   DISALLOW_COPY_AND_ASSIGN(ResultExprImpl);
 };
 
 }  // namespace internal
 }  // namespace bpf_dsl
 }  // namespace sandbox
 
 #endif  // SANDBOX_LINUX_BPF_DSL_BPF_DSL_IMPL_H_