Mac: Make ScopedTypeRef require explicit constructors

chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/extensions/browser_actions_controller.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 477 matching lines @@
       // container view.
       [button removeFromSuperview];
       [button setAlphaValue:0.0];
     }
   }
 }
 
 - (void)removeViewForAction:(ToolbarActionViewController*)action {
   // We're about to remove the button view from the container as well as from
   // |buttons_|, so make sure we retain a reference.
-  base::scoped_nsobject<BrowserActionButton> button =
-      [[self buttonForId:action->GetId()] retain];
+  base::scoped_nsobject<BrowserActionButton> button(
+      [[self buttonForId:action->GetId()] retain]);
 
   // Note: We remove the button from the view and the buttons list first because
   // destroying it (or calling -onRemoved) can cause redraws, and we don't want
   // to include it when the view is gone.
   [button removeFromSuperview];
   [buttons_ removeObject:button];
 
   [button onRemoved];
 
   [containerView_ setMaxDesiredWidth:toolbarActionsBar_->GetMaximumWidth()];
@@ skipping 330 matching lines @@
 }
 
 #pragma mark -
 #pragma mark Testing Methods
 
 - (BrowserActionButton*)buttonWithIndex:(NSUInteger)index {
   return index < [buttons_ count] ? [buttons_ objectAtIndex:index] : nil;
 }
 
 @end