Null-check ThreadTaskRunnerHandle::Get() before doing Connect() in BC::Init()

content/browser/browser_context.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 "content/public/browser/browser_context.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <algorithm>
 #include <limits>
 #include <memory>
 #include <utility>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/guid.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/rand_util.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "content/browser/blob_storage/chrome_blob_storage_context.h"
 #include "content/browser/download/download_manager_impl.h"
 #include "content/browser/indexed_db/indexed_db_context_impl.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 #include "content/browser/mojo/constants.h"
 #include "content/browser/push_messaging/push_messaging_router.h"
 #include "content/browser/storage_partition_impl_map.h"
 #include "content/common/child_process_host_impl.h"
 #include "content/public/browser/blob_handle.h"
@@ skipping 374 matching lines @@
   user_service::AssociateShellUserIdWithUserDir(new_id, path);
   RemoveBrowserContextFromUserIdMap(browser_context);
   g_user_id_to_context.Get()[new_id] = browser_context;
   browser_context->SetUserData(kMojoShellUserId,
                                new ShellUserIdHolder(new_id));
 
   browser_context->SetUserData(kMojoWasInitialized,
                                new base::SupportsUserData::Data);
 
   MojoShellConnection* shell = MojoShellConnection::GetForProcess();
-  if (shell) {
+  if (shell && base::ThreadTaskRunnerHandle::Get()) {
     // NOTE: Many unit tests create a TestBrowserContext without initializing
     // Mojo or the global Mojo shell connection.
 
     shell::mojom::ShellClientPtr shell_client;
     shell::mojom::ShellClientRequest shell_client_request =
         mojo::GetProxy(&shell_client);
 
     shell::mojom::PIDReceiverPtr pid_receiver;
     shell::Connector::ConnectParams params(
         shell::Identity(kBrowserMojoApplicationName, new_id));
@@ skipping 58 matching lines @@
       << "Attempting to destroy a BrowserContext that never called "
       << "Initialize()";
 
   RemoveBrowserContextFromUserIdMap(this);
 
   if (GetUserData(kDownloadManagerKeyName))
     GetDownloadManager(this)->Shutdown();
 }
 
 }  // namespace content