Reland of http://crrev.com/241548.

chrome_elf/blacklist/test/blacklist_test_dll_2.cc

 // Copyright 2013 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 <windows.h>
 
-#include "chrome_elf/chrome_elf_main.h"
+const wchar_t kDll2Beacon[] = L"{F70A0100-2889-4629-9B44-610FE5C73231}";
 
-#include "chrome_elf/ntdll_cache.h"
-
-void InitChromeElf() {
-  // This method is a no-op which may be called to force a load-time dependency
-  // on chrome_elf.dll.
+extern "C" {
+// Have a dummy export so that the module gets an export table entry.
+void DummyExport() {}
 }
 
 BOOL APIENTRY DllMain(HMODULE module, DWORD reason, LPVOID reserved) {
-  if (reason == DLL_PROCESS_ATTACH)
-    InitCache();
+  if (reason == DLL_PROCESS_ATTACH) {
+    ::SetEnvironmentVariable(kDll2Beacon, L"1");
+  }
   return TRUE;
 }