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

components/guest_view/browser/guest_view_manager.cc

 // Copyright 2014 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 "components/guest_view/browser/guest_view_manager.h"
 
 #include <tuple>
 #include <utility>
 
 #include "base/macros.h"
@@ skipping 475 matching lines @@
     const GuestViewManager::ElementInstanceKey& other) const {
   return (embedder_process_id == other.embedder_process_id) &&
          (element_instance_id == other.element_instance_id);
 }
 
 GuestViewManager::GuestViewData::GuestViewData(
     const GuestViewCreateFunction& create_function,
     const GuestViewCleanUpFunction& cleanup_function)
     : create_function(create_function), cleanup_function(cleanup_function) {}
 
+GuestViewManager::GuestViewData::GuestViewData(const GuestViewData& other) =
+    default;
+
 GuestViewManager::GuestViewData::~GuestViewData() {}
 
 }  // namespace guest_view