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

chrome/browser/media/router/media_route.h

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTE_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTE_H_
 
 #include <string>
 
 #include "base/containers/small_map.h"
@@ skipping 24 matching lines @@
   //                      provider. empty otherwise.
   // |for_display|: Set to true if this route should be displayed for
   //                |media_sink_id| in UI.
   MediaRoute(const MediaRoute::Id& media_route_id,
              const MediaSource& media_source,
              const MediaSink::Id& media_sink_id,
              const std::string& description,
              bool is_local,
              const std::string& custom_controller_path,
              bool for_display);
+  MediaRoute(const MediaRoute& other);
   ~MediaRoute();
 
   // The media route identifier.
   const MediaRoute::Id& media_route_id() const { return media_route_id_; }
 
   // The media source being routed.
   const MediaSource& media_source() const { return media_source_; }
 
   // The ID of sink being routed to.
   const MediaSink::Id& media_sink_id() const { return media_sink_id_; }
@@ skipping 24 matching lines @@
   MediaSink::Id media_sink_id_;
   std::string description_;
   bool is_local_;
   std::string custom_controller_path_;
   bool for_display_;
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTE_H_