Use constexpr TaskTraits constructor in chrome.

chrome/renderer/sandbox_status_extension_android.cc

 // Copyright 2017 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/renderer/sandbox_status_extension_android.h"
 
 #include "base/android/build_info.h"
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/memory/ptr_util.h"
@@ skipping 87 matching lines @@
   v8::Local<v8::Function> callback;
   if (!args->GetNext(&callback)) {
     args->ThrowError();
     return;
   }
 
   auto global_callback =
       base::MakeUnique<v8::Global<v8::Function>>(args->isolate(), callback);
 
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock(),
+      FROM_HERE, {base::MayBlock()},
       base::Bind(&SandboxStatusExtension::ReadSandboxStatus, this),
       base::Bind(&SandboxStatusExtension::RunCallback, this,
                  base::Passed(&global_callback)));
 }
 
 std::unique_ptr<base::Value> SandboxStatusExtension::ReadSandboxStatus() {
   std::string secontext;
   base::FilePath path(FILE_PATH_LITERAL("/proc/self/attr/current"));
   base::ReadFileToString(path, &secontext);
 
@@ skipping 29 matching lines @@
   v8::Local<v8::Function> callback_local =
       v8::Local<v8::Function>::New(isolate, *callback);
 
   std::unique_ptr<content::V8ValueConverter> converter(
       content::V8ValueConverter::create());
 
   v8::Local<v8::Value> argv[] = {converter->ToV8Value(status.get(), context)};
   render_frame()->GetWebFrame()->CallFunctionEvenIfScriptDisabled(
       callback_local, v8::Object::New(isolate), 1, argv);
 }