Convert //ash from scoped_ptr to std::unique_ptr

ash/display/root_window_transformers_unittest.cc

Index: ash/display/root_window_transformers_unittest.cc
diff --git a/ash/display/root_window_transformers_unittest.cc b/ash/display/root_window_transformers_unittest.cc
index 01dab0ee8917c21de070ace2ef7c8488cd1d0162..45bf2b0aa32885756bc084f9caa85249c815a06f 100644
--- a/ash/display/root_window_transformers_unittest.cc
+++ b/ash/display/root_window_transformers_unittest.cc
@@ -115,7 +115,7 @@ float GetStoredUIScale(int64_t id) {
       GetEffectiveUIScale();
 }
 
-scoped_ptr<RootWindowTransformer>
+std::unique_ptr<RootWindowTransformer>
 CreateCurrentRootWindowTransformerForMirroring() {
   DisplayManager* display_manager = Shell::GetInstance()->display_manager();
   DCHECK(display_manager->IsInMirrorMode());
@@ -123,7 +123,7 @@ CreateCurrentRootWindowTransformerForMirroring() {
       display_manager->GetDisplayInfo(display_manager->mirroring_display_id());
   const DisplayInfo& source_display_info = display_manager->GetDisplayInfo(
       gfx::Screen::GetScreen()->GetPrimaryDisplay().id());
-  return scoped_ptr<RootWindowTransformer>(
+  return std::unique_ptr<RootWindowTransformer>(
       CreateRootWindowTransformerForMirroredDisplay(source_display_info,
                                                     mirror_display_info));
 }
@@ -409,7 +409,7 @@ TEST_F(RootWindowTransformersTest, LetterBoxPillarBox) {
   DisplayManager* display_manager = Shell::GetInstance()->display_manager();
   display_manager->SetMultiDisplayMode(DisplayManager::MIRRORING);
   UpdateDisplay("400x200,500x500");
-  scoped_ptr<RootWindowTransformer> transformer(
+  std::unique_ptr<RootWindowTransformer> transformer(
       CreateCurrentRootWindowTransformerForMirroring());
   // Y margin must be margin is (500 - 500/400 * 200) / 2 = 125.
   EXPECT_EQ("0,125,0,125", transformer->GetHostInsets().ToString());