Cleanup: IWYU for base/time.h in sync/.

sync/internal_api/base_node.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 "sync/internal_api/public/base_node.h"
 
 #include "base/base64.h"
 #include "base/sha1.h"
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
@@ skipping 163 matching lines @@
 
 int64 BaseNode::GetParentId() const {
   return IdToMetahandle(GetTransaction()->GetWrappedTrans(),
                         GetEntry()->Get(syncable::PARENT_ID));
 }
 
 int64 BaseNode::GetId() const {
   return GetEntry()->Get(syncable::META_HANDLE);
 }
 
-const base::Time& BaseNode::GetModificationTime() const {
+base::Time BaseNode::GetModificationTime() const {
   return GetEntry()->Get(syncable::MTIME);
 }
 
 bool BaseNode::GetIsFolder() const {
   return GetEntry()->Get(syncable::IS_DIR);
 }
 
 std::string BaseNode::GetTitle() const {
   std::string result;
   // TODO(zea): refactor bookmarks to not need this functionality.
@@ skipping 149 matching lines @@
     const sync_pb::EntitySpecifics& specifics) {
   ModelType type = GetModelTypeFromSpecifics(specifics);
   DCHECK_NE(UNSPECIFIED, type);
   if (GetModelType() != UNSPECIFIED) {
     DCHECK_EQ(GetModelType(), type);
   }
   unencrypted_data_.CopyFrom(specifics);
 }
 
 }  // namespace syncer