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

ipc/attachment_broker.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 IPC_ATTACHMENT_BROKER_H_
 #define IPC_ATTACHMENT_BROKER_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 124 matching lines @@
 
   // A vector of BrokerableAttachments that have been received, but not yet
   // consumed.
   // A std::vector is used instead of a std::map because this container is
   // expected to have few elements, for which a std::vector is expected to have
   // better performance.
   AttachmentVector attachments_;
 
   struct ObserverInfo {
     ObserverInfo();
+    ObserverInfo(const ObserverInfo& other);
     ~ObserverInfo();
 
     Observer* observer;
     int unique_id;
 
     // Notifications must be dispatched onto |runner|.
     scoped_refptr<base::SequencedTaskRunner> runner;
   };
   std::vector<ObserverInfo> observers_;
 
   // This member holds the last id given to an ObserverInfo.
   int last_unique_id_;
 
   // The AttachmentBroker can be accessed from any thread, so modifications to
   // internal state must be guarded by a lock.
   base::Lock lock_;
   DISALLOW_COPY_AND_ASSIGN(AttachmentBroker);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_ATTACHMENT_BROKER_H_