Mark the network bubble task as MayBlock to prevent it from crashing the browser.

chrome/browser/chrome_browser_main.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/browser/chrome_browser_main.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <set>
@@ skipping 17 matching lines @@
 #include "base/path_service.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/profiler/stack_sampling_profiler.h"
 #include "base/run_loop.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/sys_info.h"
+#include "base/task_scheduler/post_task.h"
 #include "base/threading/platform_thread.h"
 #include "base/time/default_tick_clock.h"
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "cc/base/switches.h"
 #include "chrome/browser/about_flags.h"
 #include "chrome/browser/after_startup_task_utils.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 1651 matching lines @@
   // Registers Chrome with the Windows Restart Manager, which will restore the
   // Chrome session when the computer is restarted after a system update.
   // This could be run as late as WM_QUERYENDSESSION for system update reboots,
   // but should run on startup if extended to handle crashes/hangs/patches.
   // Also, better to run once here than once for each HWND's WM_QUERYENDSESSION.
   ChromeBrowserMainPartsWin::RegisterApplicationRestart(parsed_command_line());
 
   // Verify that the profile is not on a network share and if so prepare to show
   // notification to the user.
   if (NetworkProfileBubble::ShouldCheckNetworkProfile(profile_)) {
-    BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
+    base::PostTaskWithTraits(
+        FROM_HERE, base::TaskTraits().MayBlock(),
         base::Bind(&NetworkProfileBubble::CheckNetworkProfile,
                    profile_->GetPath()));
   }
 #endif  // defined(OS_WIN)
 
 #if BUILDFLAG(ENABLE_RLZ) && !defined(OS_CHROMEOS)
   // Init the RLZ library. This just binds the dll and schedules a task on the
   // file thread to be run sometime later. If this is the first run we record
   // the installation event.
   int ping_delay =
@@ skipping 359 matching lines @@
   chromeos::CrosSettings::Shutdown();
 #endif  // defined(OS_CHROMEOS)
 #endif  // defined(OS_ANDROID)
 }
 
 // Public members:
 
 void ChromeBrowserMainParts::AddParts(ChromeBrowserMainExtraParts* parts) {
   chrome_extra_parts_.push_back(parts);
 }