Revert of [chrome_elf] Big cleanup and removing dependencies that recently crept in. Part 1.

chrome_elf/hook_util/test/hook_util_test_dll.cc

-// Copyright 2016 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.
-#include "chrome_elf/hook_util/test/hook_util_test_dll.h"
-
-namespace {
-
-int g_export_call_count = 0;
-
-}  // namespace
-
-extern "C" __declspec(dllexport) void ExportedApi() {
-  g_export_call_count++;
-}
-
-extern "C" __declspec(dllexport) int ExportedApiCallCount() {
-  return g_export_call_count;
-}
-
-BOOL APIENTRY DllMain(HMODULE module, DWORD reason, LPVOID reserved) {
-  return TRUE;
-}