Change the signature of SetScreenshotDelegate() to show ownership transfer more clearly.

ash/accelerators/accelerator_controller_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/caps_lock_delegate.h"
 #include "ash/ime/event.h"
 #include "ash/screenshot_delegate.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
@@ skipping 261 matching lines @@
   EXPECT_TRUE(GetController()->Process(
       ui::Accelerator(ui::VKEY_TAB, false, false, true)));
   // TakeScreenshot
   // True should always be returned regardless of the existence of the delegate.
   {
     EXPECT_TRUE(GetController()->Process(
         ui::Accelerator(ui::VKEY_F5, false, true, false)));
     EXPECT_TRUE(GetController()->Process(
         ui::Accelerator(ui::VKEY_PRINT, false, false, false)));
     DummyScreenshotDelegate* delegate = new DummyScreenshotDelegate;
-    GetController()->SetScreenshotDelegate(delegate);
+    GetController()->SetScreenshotDelegate(
+        scoped_ptr<ScreenshotDelegate>(delegate).Pass());
     EXPECT_EQ(0, delegate->handle_take_screenshot_count());
     EXPECT_TRUE(GetController()->Process(
         ui::Accelerator(ui::VKEY_F5, false, true, false)));
     EXPECT_EQ(1, delegate->handle_take_screenshot_count());
     EXPECT_TRUE(GetController()->Process(
         ui::Accelerator(ui::VKEY_PRINT, false, false, false)));
     EXPECT_EQ(2, delegate->handle_take_screenshot_count());
   }
   // ToggleCapsLock
   {
@@ skipping 23 matching lines @@
 #if !defined(OS_LINUX)
   // ToggleDesktopFullScreen (not implemented yet on Linux)
   EXPECT_TRUE(GetController()->Process(
       ui::Accelerator(ui::VKEY_F11, false, true, false)));
 #endif
 #endif
 }
 
 }  // namespace test
 }  // namespace ash