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

components/drive/sync_client.h

 // Copyright (c) 2012 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 COMPONENTS_DRIVE_SYNC_CLIENT_H_
 #define COMPONENTS_DRIVE_SYNC_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 89 matching lines @@
   enum SyncState {
     SUSPENDED,  // Task is currently inactive.
     PENDING,  // Task is going to run.
     RUNNING,  // Task is running.
   };
 
   typedef std::pair<SyncType, std::string> SyncTaskKey;
 
   struct SyncTask {
     SyncTask();
+    SyncTask(const SyncTask& other);
     ~SyncTask();
     SyncState state;
     ClientContext context;
     base::Callback<base::Closure(const ClientContext& context)> task;
     bool should_run_again;
     base::Closure cancel_closure;
     std::vector<SyncTaskKey> dependent_tasks;
     std::vector<FileOperationCallback> waiting_callbacks;
   };
 
@@ skipping 71 matching lines @@
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<SyncClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncClient);
 };
 
 }  // namespace internal
 }  // namespace drive
 
 #endif  // COMPONENTS_DRIVE_SYNC_CLIENT_H_