Revert of Turn libbase into a component

src/base/base-export.h

Index: src/base/base-export.h
diff --git a/src/base/base-export.h b/src/base/base-export.h
deleted file mode 100644
index a2b3dacaf73b9144af22a41bf65e5b6ee584863e..0000000000000000000000000000000000000000
--- a/src/base/base-export.h
+++ /dev/null
@@ -1,31 +0,0 @@
-// Copyright 2016 the V8 project 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 V8_BASE_BASE_EXPORT_H_
-#define V8_BASE_BASE_EXPORT_H_
-
-#include "include/v8config.h"
-
-#if V8_OS_WIN
-
-#ifdef BUILDING_V8_BASE_SHARED
-#define V8_BASE_EXPORT __declspec(dllexport)
-#elif USING_V8_BASE_SHARED
-#define V8_BASE_EXPORT __declspec(dllimport)
-#else
-#define V8_BASE_EXPORT
-#endif  // BUILDING_V8_BASE_SHARED
-
-#else  // !V8_OS_WIN
-
-// Setup for Linux shared library export.
-#ifdef BUILDING_V8_BASE_SHARED
-#define V8_BASE_EXPORT __attribute__((visibility("default")))
-#else
-#define V8_BASE_EXPORT
-#endif
-
-#endif  // V8_OS_WIN
-
-#endif  // V8_BASE_BASE_EXPORT_H_