Convert //chrome/browser/ui from scoped_ptr to std::unique_ptr

chrome/browser/ui/aura/native_window_tracker_aura.cc

Index: chrome/browser/ui/aura/native_window_tracker_aura.cc
diff --git a/chrome/browser/ui/aura/native_window_tracker_aura.cc b/chrome/browser/ui/aura/native_window_tracker_aura.cc
index bd1106aafdad099f479fcab894245c9945e039aa..94c3f80c4320baa914777872373831258c7116dd 100644
--- a/chrome/browser/ui/aura/native_window_tracker_aura.cc
+++ b/chrome/browser/ui/aura/native_window_tracker_aura.cc
@@ -28,7 +28,8 @@ void NativeWindowTrackerAura::OnWindowDestroying(
 }
 
 // static
-scoped_ptr<NativeWindowTracker> NativeWindowTracker::Create(
+std::unique_ptr<NativeWindowTracker> NativeWindowTracker::Create(
     gfx::NativeWindow window) {
-  return scoped_ptr<NativeWindowTracker>(new NativeWindowTrackerAura(window));
+  return std::unique_ptr<NativeWindowTracker>(
+      new NativeWindowTrackerAura(window));
 }