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

components/drive/file_change.cc

 // 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.
 
 #include "components/drive/file_change.h"
 
 #include <sstream>
 
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
@@ skipping 73 matching lines @@
   std::ostringstream ss;
   ss << "{ ";
   for (size_t i = 0; i < list_.size(); ++i)
     ss << list_[i].DebugString() << ", ";
   ss << "}";
   return ss.str();
 }
 
 FileChange::FileChange() {
 }
+FileChange::FileChange(const FileChange& other) = default;
 FileChange::~FileChange() {}
 
 void FileChange::Update(const base::FilePath file_path,
                         const FileChange::Change& new_change) {
   map_[file_path].Update(new_change);
 }
 
 void FileChange::Update(const base::FilePath file_path,
                         const FileChange::ChangeList& new_change) {
   for (ChangeList::List::const_iterator it = new_change.list().begin();
@@ skipping 42 matching lines @@
   ss << "{ ";
   for (FileChange::Map::const_iterator it = map_.begin(); it != map_.end();
        it++) {
     ss << it->first.value() << ": " << it->second.DebugString() << ", ";
   }
   ss << "}";
   return ss.str();
 }
 
 }  // namespace drive