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

components/sessions/core/serialized_navigation_entry.h

 // Copyright 2013 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_SESSIONS_CORE_SERIALIZED_NAVIGATION_ENTRY_H_
 #define COMPONENTS_SESSIONS_CORE_SERIALIZED_NAVIGATION_ENTRY_H_
 
 #include <stdint.h>
 
 #include <set>
@@ skipping 32 matching lines @@
 class SESSIONS_EXPORT SerializedNavigationEntry {
  public:
   enum BlockedState {
     STATE_INVALID = 0,
     STATE_ALLOWED = 1,
     STATE_BLOCKED = 2,
   };
 
   // Creates an invalid (index < 0) SerializedNavigationEntry.
   SerializedNavigationEntry();
+  SerializedNavigationEntry(const SerializedNavigationEntry& other);
   ~SerializedNavigationEntry();
 
   // Construct a SerializedNavigationEntry for a particular index from a sync
   // protocol buffer.  Note that the sync protocol buffer doesn't contain all
   // SerializedNavigationEntry fields.  Also, the timestamp of the returned
   // SerializedNavigationEntry is nulled out, as we assume that the protocol
   // buffer is from a foreign session.
   static SerializedNavigationEntry FromSyncData(
       int index,
       const sync_pb::TabNavigation& sync_data);
@@ skipping 75 matching lines @@
   std::vector<GURL> redirect_chain_;  // Not persisted.
 
   // Additional information.
   BlockedState blocked_state_;
   std::set<std::string> content_pack_categories_;
 };
 
 }  // namespace sessions
 
 #endif  // COMPONENTS_SESSIONS_CORE_SERIALIZED_NAVIGATION_ENTRY_H_