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

chrome_elf/blacklist/test/blacklist_test_dll_3.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"
-
-#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.
-}
+const wchar_t kDll3Beacon[] = L"{9E056AEC-169E-400c-B2D0-5A07E3ACE2EB}";
 
 BOOL APIENTRY DllMain(HMODULE module, DWORD reason, LPVOID reserved) {
-  if (reason == DLL_PROCESS_ATTACH)
-    InitCache();
+  if (reason == DLL_PROCESS_ATTACH) {
+    ::SetEnvironmentVariable(kDll3Beacon, L"1");
+  }
   return TRUE;
 }