Cache IsNonBrowserProcess values, so we only take a loader-lock the first time.

chrome_elf/blacklist/test/blacklist_test_main_dll.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/blacklist/blacklist.h"
+#include "chrome_elf/chrome_elf_util.h"
 
 extern "C" void InitBlacklistTestDll() {}
 
 BOOL APIENTRY DllMain(HMODULE module, DWORD reason, LPVOID reserved) {
   if (reason == DLL_PROCESS_ATTACH) {
+    InitializeIsNonBrowserProcess();
     blacklist::Initialize(true);  // force always on, no beacon
   }
 
   return TRUE;
 }