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

chrome/browser/sync_file_system/subtree_set.cc

 // 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.
 
 #include "chrome/browser/sync_file_system/subtree_set.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "storage/common/fileapi/file_system_util.h"
 
 namespace sync_file_system {
 
 SubtreeSet::Node::Node()
     : contained_as_subtree_root(false),
       number_of_subtrees_below(0) {
 }
 
 SubtreeSet::Node::Node(bool contained_as_subtree_root,
                        size_t number_of_subtrees_below)
     : contained_as_subtree_root(contained_as_subtree_root),
       number_of_subtrees_below(number_of_subtrees_below) {
 }
 
 SubtreeSet::SubtreeSet() {}
+SubtreeSet::SubtreeSet(const SubtreeSet& other) = default;
 SubtreeSet::~SubtreeSet() {}
 
 bool SubtreeSet::IsDisjointWith(const base::FilePath& subtree_root) const {
   base::FilePath::StringType normalized_subtree_root =
       storage::VirtualPath::GetNormalizedFilePath(subtree_root);
 
   // Check if |subtree_root| contains any of subtrees in the container.
   if (ContainsKey(inclusive_ancestors_of_subtree_roots_,
                   normalized_subtree_root))
     return false;
@@ skipping 68 matching lines @@
 
 size_t SubtreeSet::size() const {
   Subtrees::const_iterator found =
       inclusive_ancestors_of_subtree_roots_.find(storage::VirtualPath::kRoot);
   if (found == inclusive_ancestors_of_subtree_roots_.end())
     return 0;
   return found->second.number_of_subtrees_below;
 }
 
 }  // namespace sync_file_system