Move //mojo/services/X/public/... to //mojo/services/X/... (part 1).

mojo/services/files/public/c/lib/errno_impl.h

-// Copyright 2015 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 SERVICES_FILES_C_LIB_ERRNO_IMPL_H_
-#define SERVICES_FILES_C_LIB_ERRNO_IMPL_H_
-
-#include "mojo/public/cpp/system/macros.h"
-
-namespace mojio {
-
-// |ErrnoImpl| is an interface for getting/setting errno values.
-class ErrnoImpl {
- public:
-  // When destroyed, this class either preserves the errno value at creation or
-  // sets it to an explicit value. (Without this, internal calls may set errno
-  // to a value that shouldn't be visible to the caller.)
-  class Setter {
-   public:
-    explicit Setter(ErrnoImpl* errno_impl)
-        : errno_impl_(errno_impl), error_(errno_impl_->Get()) {}
-    ~Setter() { errno_impl_->Set(error_); }
-
-    // If |error| is 0, this does nothing and returns true. Otherwise, this will
-    // arrange for the |ErrnoImpl|'s |Set()| to be called with the value of
-    // |error| (which should be a valid errno code) on destruction, and returns
-    // false.
-    bool Set(int error) {
-      if (error == 0)
-        return true;
-      error_ = error;
-      return false;
-    }
-
-   private:
-    ErrnoImpl* const errno_impl_;
-    int error_;
-
-    MOJO_DISALLOW_COPY_AND_ASSIGN(Setter);
-  };
-
-  virtual int Get() const = 0;
-  virtual void Set(int error) = 0;
-
- protected:
-  ErrnoImpl() {}
-  // Important: Destructors should not modify (the "real") errno (or any global
-  // state that may affect implementations of |ErrnoImpl|).
-  virtual ~ErrnoImpl() {}
-
- private:
-  MOJO_DISALLOW_COPY_AND_ASSIGN(ErrnoImpl);
-};
-
-}  // namespace mojio
-
-#endif  // SERVICES_FILES_C_LIB_ERRNO_IMPL_H_