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

ash/accelerators/accelerator_controller.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/launcher/launcher.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/screenshot_delegate.h"
@@ skipping 144 matching lines @@
 void AcceleratorController::UnregisterAll(
     ui::AcceleratorTarget* target) {
   accelerator_manager_->UnregisterAll(target);
 }
 
 bool AcceleratorController::Process(const ui::Accelerator& accelerator) {
   return accelerator_manager_->Process(accelerator);
 }
 
 void AcceleratorController::SetScreenshotDelegate(
-    ScreenshotDelegate* screenshot_delegate) {
-  screenshot_delegate_.reset(screenshot_delegate);
+    scoped_ptr<ScreenshotDelegate> screenshot_delegate) {
+  screenshot_delegate_.swap(screenshot_delegate);
 }
 
 void AcceleratorController::SetCapsLockDelegate(
     scoped_ptr<CapsLockDelegate> caps_lock_delegate) {
   caps_lock_delegate_.swap(caps_lock_delegate);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // AcceleratorController, ui::AcceleratorTarget implementation:
 
@@ skipping 30 matching lines @@
       NOTREACHED() << "Unhandled action " << it->second;;
   }
   return false;
 }
 
 bool AcceleratorController::CanHandleAccelerators() const {
   return true;
 }
 
 }  // namespace ash