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

components/invalidation/public/invalidation.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 COMPONENTS_INVALIDATION_PUBLIC_INVALIDATION_H_
 #define COMPONENTS_INVALIDATION_PUBLIC_INVALIDATION_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 18 matching lines @@
  public:
   // Factory functions.
   static Invalidation Init(const invalidation::ObjectId& id,
                            int64_t version,
                            const std::string& payload);
   static Invalidation InitUnknownVersion(const invalidation::ObjectId& id);
   static Invalidation InitFromDroppedInvalidation(const Invalidation& dropped);
   static scoped_ptr<Invalidation> InitFromValue(
       const base::DictionaryValue& value);
 
+  Invalidation(const Invalidation& other);
   ~Invalidation();
 
   // Compares two invalidations.  The comparison ignores ack-tracking state.
   bool Equals(const Invalidation& other) const;
 
   invalidation::ObjectId object_id() const;
   bool is_unknown_version() const;
 
   // Safe to call only if is_unknown_version() returns false.
   int64_t version() const;
@@ skipping 70 matching lines @@
   AckHandle ack_handle_;
 
   // The acknowledgement tracking handler and its thread.
   base::WeakPtr<AckHandler> ack_handler_;
   scoped_refptr<base::SequencedTaskRunner> ack_handler_task_runner_;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_INVALIDATION_PUBLIC_INVALIDATION_H_