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

chrome/browser/media/router/issue.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_ISSUE_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_ISSUE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 42 matching lines @@
   // |help_url|: Required if one of the actions is learn-more.
   Issue(const std::string& title,
         const std::string& message,
         const IssueAction& default_action,
         const std::vector<IssueAction>& secondary_actions,
         const MediaRoute::Id& route_id,
         const Severity severity,
         bool is_blocking,
         const std::string& helpUrl);
 
+  Issue(const Issue& other);
+
   ~Issue();
 
   // See constructor comments for more information about these fields.
   const std::string& title() const { return title_; }
   const std::string& message() const { return message_; }
   IssueAction default_action() const { return default_action_; }
   const std::vector<IssueAction>& secondary_actions() const {
     return secondary_actions_;
   }
   MediaRoute::Id route_id() const { return route_id_; }
@@ skipping 13 matching lines @@
   std::string route_id_;
   Severity severity_;
   Issue::Id id_;
   bool is_blocking_;
   GURL help_url_;
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_ISSUE_H_