Move NaCl loader related files to components/nacl/loader.

chrome/nacl/nacl_validation_db.h

-// 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.
-
-#ifndef CHROME_NACL_NACL_VALIDATION_DB_H_
-#define CHROME_NACL_NACL_VALIDATION_DB_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-
-struct NaClFileToken;
-
-class NaClValidationDB {
- public:
-  NaClValidationDB() {}
-  virtual ~NaClValidationDB() {}
-
-  virtual bool QueryKnownToValidate(const std::string& signature) = 0;
-  virtual void SetKnownToValidate(const std::string& signature) = 0;
-  virtual bool ResolveFileToken(struct NaClFileToken* file_token,
-                                int32* fd, std::string* path) = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(NaClValidationDB);
-};
-
-#endif  // CHROME_NACL_NACL_VALIDATION_DB_H_