Update TaskTraits in v8_platform.cc.

gin/v8_platform.cc

 // Copyright 2014 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 "gin/public/v8_platform.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/debug/stack_trace.h"
 #include "base/location.h"
 #include "base/sys_info.h"
 #include "base/task_scheduler/post_task.h"
 #include "base/task_scheduler/task_scheduler.h"
 #include "base/trace_event/trace_event.h"
 #include "gin/per_isolate_data.h"
 
 namespace gin {
 
 namespace {
 
 constexpr base::TaskTraits kBackgroundThreadTaskTraits = {
-    base::MayBlock(), base::TaskPriority::USER_VISIBLE,
-    base::TaskShutdownBehavior::BLOCK_SHUTDOWN};
+    base::TaskPriority::USER_VISIBLE};
 
 base::LazyInstance<V8Platform>::Leaky g_v8_platform = LAZY_INSTANCE_INITIALIZER;
 
 void RunWithLocker(v8::Isolate* isolate, v8::Task* task) {
   v8::Locker lock(isolate);
   task->Run();
 }
 
 class IdleTaskWithLocker : public v8::IdleTask {
  public:
@@ skipping 230 matching lines @@
 void V8Platform::RemoveTraceStateObserver(
     v8::Platform::TraceStateObserver* observer) {
   g_trace_state_dispatcher.Get().RemoveObserver(observer);
 }
 
 v8::Platform::StackTracePrinter V8Platform::GetStackTracePrinter() {
   return PrintStackTrace;
 }
 
 }  // namespace gin