Use constexpr TaskTraits constructor in content.

content/browser/frame_host/navigation_entry_screenshot_manager.cc

Index: content/browser/frame_host/navigation_entry_screenshot_manager.cc
diff --git a/content/browser/frame_host/navigation_entry_screenshot_manager.cc b/content/browser/frame_host/navigation_entry_screenshot_manager.cc
index aa740cb6efd81a995a3b5a7f75dd49dd290d75e2..193392dcec7bd17c763552891e10098e5111a98f 100644
--- a/content/browser/frame_host/navigation_entry_screenshot_manager.cc
+++ b/content/browser/frame_host/navigation_entry_screenshot_manager.cc
@@ -33,8 +33,7 @@ class ScreenshotData : public base::RefCountedThreadSafe<ScreenshotData> {
 
   void EncodeScreenshot(const SkBitmap& bitmap, base::Closure callback) {
     base::PostTaskWithTraitsAndReply(
-        FROM_HERE, base::TaskTraits().WithShutdownBehavior(
-                       base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN),
+        FROM_HERE, {base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
         base::Bind(&ScreenshotData::EncodeOnWorker, this, bitmap), callback);
   }