Convert //ash from scoped_ptr to std::unique_ptr

ash/display/window_tree_host_manager_unittest.cc

Index: ash/display/window_tree_host_manager_unittest.cc
diff --git a/ash/display/window_tree_host_manager_unittest.cc b/ash/display/window_tree_host_manager_unittest.cc
index faa8f4d3168707adbd8e880aee8a288978758ab1..1592f14bb323dbf730de241ff971d351954a581c 100644
--- a/ash/display/window_tree_host_manager_unittest.cc
+++ b/ash/display/window_tree_host_manager_unittest.cc
@@ -187,7 +187,7 @@ gfx::Display GetSecondaryDisplay() {
 void SetSecondaryDisplayLayoutAndOffset(
     display::DisplayPlacement::Position position,
     int offset) {
-  scoped_ptr<display::DisplayLayout> layout(
+  std::unique_ptr<display::DisplayLayout> layout(
       test::CreateDisplayLayout(position, offset));
   ASSERT_GT(gfx::Screen::GetScreen()->GetNumDisplays(), 1);
   Shell::GetInstance()->display_manager()->SetLayoutForCurrentDisplays(
@@ -396,7 +396,7 @@ TEST_F(WindowTreeHostManagerTest, SecondaryDisplayLayout) {
     return;
 
   // Creates windows to catch activation change event.
-  scoped_ptr<aura::Window> w1(CreateTestWindowInShellWithId(1));
+  std::unique_ptr<aura::Window> w1(CreateTestWindowInShellWithId(1));
   w1->Focus();
 
   TestObserver observer;
@@ -558,7 +558,7 @@ TEST_F(WindowTreeHostManagerTest, MirrorToDockedWithFullscreen) {
     return;
 
   // Creates windows to catch activation change event.
-  scoped_ptr<aura::Window> w1(CreateTestWindowInShellWithId(1));
+  std::unique_ptr<aura::Window> w1(CreateTestWindowInShellWithId(1));
   w1->Focus();
 
   // Docked mode.
@@ -608,7 +608,7 @@ TEST_F(WindowTreeHostManagerTest, BoundsUpdated) {
     return;
 
   // Creates windows to catch activation change event.
-  scoped_ptr<aura::Window> w1(CreateTestWindowInShellWithId(1));
+  std::unique_ptr<aura::Window> w1(CreateTestWindowInShellWithId(1));
   w1->Focus();
 
   TestObserver observer;