Rewrite scoped_ptr<T>(NULL) to use the default ctor.

chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm

 // Copyright 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/location_bar/location_bar_view_mac.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/prefs/pref_service.h"
@@ skipping 76 matching lines @@
     Browser* browser)
     : omnibox_view_(new OmniboxViewMac(this, toolbar_model, profile,
                                        command_updater, field)),
       command_updater_(command_updater),
       field_(field),
       disposition_(CURRENT_TAB),
       location_icon_decoration_(new LocationIconDecoration(this)),
       selected_keyword_decoration_(new SelectedKeywordDecoration()),
       ev_bubble_decoration_(
           new EVBubbleDecoration(location_icon_decoration_.get())),
-      plus_decoration_(NULL),
       star_decoration_(new StarDecoration(command_updater)),
       zoom_decoration_(new ZoomDecoration(this)),
       keyword_hint_decoration_(new KeywordHintDecoration()),
       profile_(profile),
       browser_(browser),
       toolbar_model_(toolbar_model),
       transition_(content::PageTransitionFromInt(
           content::PAGE_TRANSITION_TYPED |
           content::PAGE_TRANSITION_FROM_ADDRESS_BAR)),
       weak_ptr_factory_(this) {
@@ skipping 648 matching lines @@
     visible = false;
   star_decoration_->SetVisible(visible);
 }
 
 void LocationBarViewMac::UpdatePlusDecorationVisibility() {
   if (extensions::FeatureSwitch::action_box()->IsEnabled()) {
     // If the action box is enabled, hide it when input is in progress.
     plus_decoration_->SetVisible(!toolbar_model_->GetInputInProgress());
   }
 }