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

chrome/utility/media_galleries/ipc_data_source.h

 // 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.
 
 #ifndef CHROME_UTILITY_MEDIA_GALLERIES_IPC_DATA_SOURCE_H_
 #define CHROME_UTILITY_MEDIA_GALLERIES_IPC_DATA_SOURCE_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 32 matching lines @@
   bool IsStreaming() override;
   void SetBitrate(int bitrate) override;
 
   // Implementation of UtilityMessageHandler. May only be called on the utility
   // thread.
   bool OnMessageReceived(const IPC::Message& message) override;
 
  private:
   struct Request {
     Request();
+    Request(const Request& other);
     ~Request();
     uint8_t* destination;
     ReadCB callback;
   };
 
   void ReadOnUtilityThread(int64_t position,
                            int size,
                            uint8_t* data,
                            const ReadCB& read_cb);
 
   void OnRequestBlobBytesFinished(int64_t request_id, const std::string& bytes);
 
   const int64_t total_size_;
 
   scoped_refptr<base::TaskRunner> utility_task_runner_;
   std::map<int64_t, Request> pending_requests_;
   int64_t next_request_id_;
 
   base::ThreadChecker utility_thread_checker_;
 
   // Enforces that the DataSource methods are called on one other thread only.
   base::ThreadChecker data_source_thread_checker_;
 };
 
 }  // namespace metadata
 
 #endif  // CHROME_UTILITY_MEDIA_GALLERIES_IPC_DATA_SOURCE_H_