Revert "Introduce unique_fd"

This reverts commit 97b3e66d3ef598ccf8cad42bbb723273d8d61f7c.

This cherrypick was actually obsolete. The file had already moved elsewhere.

Change-Id: Ia209f230b2f5d621ec890d901dea8e5fa135fc87
diff --git a/base/include/base/unique_fd.h b/base/include/base/unique_fd.h
deleted file mode 100644
index 4117775..0000000
--- a/base/include/base/unique_fd.h
+++ /dev/null
@@ -1,79 +0,0 @@
-/*
- * Copyright (C) 2015 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef ANDROID_BASE_UNIQUE_FD_H
-#define ANDROID_BASE_UNIQUE_FD_H
-
-#include <unistd.h>
-
-#include <base/macros.h>
-
-/* Container for a file descriptor that automatically closes the descriptor as
- * it goes out of scope.
- *
- *      unique_fd ufd(open("/some/path", "r"));
- *
- *      if (ufd.get() < 0) // invalid descriptor
- *          return error;
- *
- *      // Do something useful
- *
- *      return 0; // descriptor is closed here
- */
-namespace android {
-namespace base {
-
-class unique_fd final {
- public:
-  unique_fd() : value_(-1) {}
-
-  explicit unique_fd(int value) : value_(value) {}
-  ~unique_fd() { clear(); }
-
-  unique_fd(unique_fd&& other) : value_(other.release()) {}
-  unique_fd& operator = (unique_fd&& s) {
-    reset(s.release());
-    return *this;
-  }
-
-  void reset(int new_value) {
-    if (value_ >= 0)
-      close(value_);
-    value_ = new_value;
-  }
-
-  void clear() {
-    reset(-1);
-  }
-
-  int get() const { return value_; }
-
-  int release() {
-    int ret = value_;
-    value_ = -1;
-    return ret;
-  }
-
- private:
-  int value_;
-
-  DISALLOW_COPY_AND_ASSIGN(unique_fd);
-};
-
-}  // namespace base
-}  // namespace android
-
-#endif // ANDROID_BASE_UNIQUE_FD_H