Remove unused ImmediateShutdownAndExitProcess()

This function was used only in application_lifetime.cc.
Since http://crrev.com/307026, this function has been unused.

BUG=None

Review URL: https://codereview.chromium.org/1138863003

Cr-Commit-Position: refs/heads/master@{#330280}

chrome/browser/lifetime/application_lifetime.cc

@@ -33,7 +33,6 @@
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
-#include "content/public/browser/browser_shutdown.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/notification_service.h"

content/browser/browser_main_loop.cc

@@ -50,7 +50,6 @@
 #include "content/common/host_discardable_shared_memory_manager.h"
 #include "content/common/host_shared_bitmap_manager.h"
 #include "content/public/browser/browser_main_parts.h"
-#include "content/public/browser/browser_shutdown.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/tracing_controller.h"
@@ -336,30 +335,6 @@ base::win::MemoryPressureMonitor* CreateWinMemoryPressureMonitor(
 // The currently-running BrowserMainLoop.  There can be one or zero.
 BrowserMainLoop* g_current_browser_main_loop = NULL;
 
-// This is just to be able to keep ShutdownThreadsAndCleanUp out of
-// the public interface of BrowserMainLoop.
-class BrowserShutdownImpl {
- public:
-  static void ImmediateShutdownAndExitProcess() {
-    DCHECK(g_current_browser_main_loop);
-    g_current_browser_main_loop->ShutdownThreadsAndCleanUp();
-
-#if defined(OS_WIN)
-    // At this point the message loop is still running yet we've shut everything
-    // down. If any messages are processed we'll likely crash. Exit now.
-    ExitProcess(RESULT_CODE_NORMAL_EXIT);
-#elif defined(OS_POSIX) && !defined(OS_MACOSX)
-    _exit(RESULT_CODE_NORMAL_EXIT);
-#else
-    NOTIMPLEMENTED();
-#endif
-  }
-};
-
-void ImmediateShutdownAndExitProcess() {
-  BrowserShutdownImpl::ImmediateShutdownAndExitProcess();
-}
-
 // For measuring memory usage after each task. Behind a command line flag.
 class BrowserMainLoop::MemoryObserver : public base::MessageLoop::TaskObserver {
  public:

content/content_browser.gypi

@@ -91,7 +91,6 @@
       'public/browser/browser_plugin_guest_manager.cc',
       'public/browser/browser_plugin_guest_manager.h',
       'public/browser/browser_ppapi_host.h',
-      'public/browser/browser_shutdown.h',
       'public/browser/browser_thread.h',
       'public/browser/browser_thread_delegate.h',
       'public/browser/browser_url_handler.h',

content/public/browser/browser_shutdown.h

-// 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.
-
-#ifndef CONTENT_PUBLIC_BROWSER_BROWSER_SHUTDOWN_H_
-#define CONTENT_PUBLIC_BROWSER_BROWSER_SHUTDOWN_H_
-
-#include "content/common/content_export.h"
-
-namespace content {
-
-// This can be used for as-fast-as-possible shutdown, in cases where
-// time for shutdown is limited and we just need to write out as much
-// data as possible before our time runs out.
-//
-// This causes the shutdown sequence embodied by
-// BrowserMainParts::PostMainMessageLoopRun through
-// BrowserMainParts::PostDestroyThreads to occur, i.e. we pretend the
-// message loop finished, all threads are stopped in sequence and then
-// PostDestroyThreads is called.
-//
-// As this violates the normal order of shutdown, likely leaving the
-// process in a bad state, the last thing this function does is
-// terminate the process (right after calling
-// BrowserMainParts::PostDestroyThreads).
-CONTENT_EXPORT void ImmediateShutdownAndExitProcess();
-
-}  // namespace content
-
-#endif  // CONTENT_PUBLIC_BROWSER_BROWSER_SHUTDOWN_H_