Use constexpr TaskTraits constructor in content.

content/public/browser/browser_thread.h

Index: content/public/browser/browser_thread.h
diff --git a/content/public/browser/browser_thread.h b/content/public/browser/browser_thread.h
index 8422091d3024087800f8365e034083b05cc3a6f0..78d471ea14cc6612dc12f2d2e277cf210e2205a5 100644
--- a/content/public/browser/browser_thread.h
+++ b/content/public/browser/browser_thread.h
@@ -74,8 +74,7 @@ class CONTENT_EXPORT BrowserThread {
     // DEPRECATED: prefer base/task_scheduler/post_task.h for new classes
     // requiring a background file I/O task runner, i.e.:
     //   base::CreateSequencedTaskRunnerWithTraits(
-    //       base::TaskTraits().MayBlock()
-    //           .WithPriority(base::TaskPriority::BACKGROUND))
+    //       {base::MayBlock(), base::TaskPriority::BACKGROUND})
     //   Note: You can use base::TaskPriority::USER_VISIBLE instead of
     //         base::TaskPriority::BACKGROUND if the latency of this operation
     //         is visible but non-blocking to the user.
@@ -86,8 +85,7 @@ class CONTENT_EXPORT BrowserThread {
     // DEPRECATED: prefer base/task_scheduler/post_task.h for new classes
     // requiring a user-blocking file I/O task runner, i.e.:
     //   base::CreateSequencedTaskRunnerWithTraits(
-    //       base::TaskTraits().MayBlock()
-    //           .WithPriority(base::TaskPriority::USER_BLOCKING))
+    //       {base::MayBlock(), base::TaskPriority::USER_BLOCKING})
     FILE_USER_BLOCKING,
 
     // Used to launch and terminate Chrome processes.
@@ -188,7 +186,7 @@ class CONTENT_EXPORT BrowserThread {
   // DEPRECATED: use base/task_scheduler/post_task.h instead.
   //   * BrowserThread::PostBlockingPoolTask(AndReply)(...) =>
   //         base::PostTaskWithTraits(AndReply)(
-  //             FROM_HERE, base::TaskTraits().MayBlock()...)
+  //             FROM_HERE, {base::MayBlock()})
   //   * BrowserThread::PostBlockingPoolSequencedTask =>
   //         Share a single SequencedTaskRunner created via
   //         base::CreateSequencedTaskRunnerWithTraits() instead of sharing a
@@ -245,7 +243,7 @@ class CONTENT_EXPORT BrowserThread {
   //       base::SequencedWorkerPool::GetSequenceToken())
   //  =>
   //   base::CreateSequencedTaskRunnerWithTraits(
-  //       base::TaskTraits().MayBlock()...).
+  //       {base::MayBlock()}).
   static base::SequencedWorkerPool* GetBlockingPool() WARN_UNUSED_RESULT;
 
   // Callable on any thread.  Returns whether the given well-known thread is