Use constexpr TaskTraits constructor in content.

Use a constexpr constructor that accepts traits in any order instead of
the builder pattern to construct TaskTraits in content.

BUG=713683
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[email protected]
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2857983003
Cr-Commit-Position: refs/heads/master@{#469433}
diff --git a/content/browser/plugin_service_impl.cc b/content/browser/plugin_service_impl.cc
index 542e873..b122ced 100644
--- a/content/browser/plugin_service_impl.cc
+++ b/content/browser/plugin_service_impl.cc
@@ -98,10 +98,8 @@
 
 void PluginServiceImpl::Init() {
   plugin_list_task_runner_ = base::CreateSequencedTaskRunnerWithTraits(
-      base::TaskTraits()
-          .MayBlock()
-          .WithPriority(base::TaskPriority::USER_VISIBLE)
-          .WithShutdownBehavior(base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN));
+      {base::MayBlock(), base::TaskPriority::USER_VISIBLE,
+       base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN});
   PluginList::Singleton()->set_will_load_plugins_callback(
       base::Bind(&WillLoadPluginsCallback, &plugin_list_sequence_checker_));