chrome: Add out-of-line copy ctors for complex classes.

chrome/browser/ui/views/autofill/autofill_dialog_views.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 "chrome/browser/ui/views/autofill/autofill_dialog_views.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 1891 matching lines @@
   return scrollable_area_;
 }
 
 AutofillDialogViews::DetailsGroup::DetailsGroup(DialogSection section)
     : section(section),
       container(NULL),
       manual_input(NULL),
       suggested_info(NULL),
       suggested_button(NULL) {}
 
+AutofillDialogViews::DetailsGroup::DetailsGroup(const DetailsGroup& other) =
+    default;
+
 AutofillDialogViews::DetailsGroup::~DetailsGroup() {}
 
 }  // namespace autofill