Add support for multiple zygote fork delegates

chrome/app/chrome_main_delegate.cc

 // Copyright (c) 2012 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/app/chrome_main_delegate.h"
 
 #include "base/command_line.h"
 #include "base/cpu.h"
 #include "base/files/file_path.h"
 #include "base/i18n/rtl.h"
@@ skipping 837 matching lines @@
 }
 
 bool ChromeMainDelegate::DelaySandboxInitialization(
     const std::string& process_type) {
   // NaClLoader does this in NaClMainPlatformDelegate::EnableSandbox().
   // No sandbox needed for relauncher.
   return process_type == switches::kNaClLoaderProcess ||
       process_type == switches::kRelauncherProcess;
 }
 #elif defined(OS_POSIX) && !defined(OS_ANDROID)
-content::ZygoteForkDelegate* ChromeMainDelegate::ZygoteStarting() {
-#if defined(DISABLE_NACL)
-  return NULL;
-#else
-  return new NaClForkDelegate();
+void ChromeMainDelegate::ZygoteStarting(
+    ScopedVector<content::ZygoteForkDelegate>* delegates) {
+#if !defined(DISABLE_NACL)
+  delegates->push_back(new NaClForkDelegate());
 #endif
 }
 
 void ChromeMainDelegate::ZygoteForked() {
   Profiling::ProcessStarted();
   if (Profiling::BeingProfiled()) {
     base::debug::RestartProfilingAfterFork();
     SetUpProfilingShutdownHandler();
   }
 
@@ skipping 37 matching lines @@
 }
 
 content::ContentUtilityClient*
 ChromeMainDelegate::CreateContentUtilityClient() {
 #if defined(CHROME_MULTIPLE_DLL_BROWSER)
   return NULL;
 #else
   return g_chrome_content_utility_client.Pointer();
 #endif
 }