Convert //ash from scoped_ptr to std::unique_ptr

ash/accelerators/accelerator_commands_unittest.cc

Index: ash/accelerators/accelerator_commands_unittest.cc
diff --git a/ash/accelerators/accelerator_commands_unittest.cc b/ash/accelerators/accelerator_commands_unittest.cc
index 3bc1ece05e2cda21a41dfe2de038deee205c6861..ff65dbaca31f95dd6a8968ca8745c161440c6ec3 100644
--- a/ash/accelerators/accelerator_commands_unittest.cc
+++ b/ash/accelerators/accelerator_commands_unittest.cc
@@ -20,9 +20,9 @@ namespace accelerators {
 typedef test::AshTestBase AcceleratorCommandsTest;
 
 TEST_F(AcceleratorCommandsTest, ToggleMinimized) {
-  scoped_ptr<aura::Window> window1(
+  std::unique_ptr<aura::Window> window1(
       CreateTestWindowInShellWithBounds(gfx::Rect(5, 5, 20, 20)));
-  scoped_ptr<aura::Window> window2(
+  std::unique_ptr<aura::Window> window2(
       CreateTestWindowInShellWithBounds(gfx::Rect(5, 5, 20, 20)));
   wm::WindowState* window_state1 = wm::GetWindowState(window1.get());
   wm::WindowState* window_state2 = wm::GetWindowState(window2.get());