Allow OSExchangeData::Provider to be overridden at run time.

components/bookmarks/browser/bookmark_node_data_unittest.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 "components/bookmarks/browser/bookmark_node_data.h"
 
 #include <memory>
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
@@ skipping 44 matching lines @@
   base::ScopedTempDir profile_dir_;
   std::unique_ptr<BookmarkModel> model_;
   std::unique_ptr<ui::PlatformEventSource> event_source_;
   base::MessageLoopForUI loop_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkNodeDataTest);
 };
 
 namespace {
 
-ui::OSExchangeData::Provider* CloneProvider(const ui::OSExchangeData& data) {
+std::unique_ptr<ui::OSExchangeData::Provider> CloneProvider(
+    const ui::OSExchangeData& data) {
   return data.provider().Clone();
 }
 
 }  // namespace
 
 // Makes sure BookmarkNodeData is initially invalid.
 TEST_F(BookmarkNodeDataTest, InitialState) {
   BookmarkNodeData data;
   EXPECT_FALSE(data.is_valid());
 }
@@ skipping 322 matching lines @@
   ASSERT_EQ(1u, read_data.size());
 
   // Verify that the read data contains the same meta info.
   BookmarkNode::MetaInfoMap meta_info_map = read_data.elements[0].meta_info_map;
   EXPECT_EQ(2u, meta_info_map.size());
   EXPECT_EQ("somevalue", meta_info_map["somekey"]);
   EXPECT_EQ("someothervalue", meta_info_map["someotherkey"]);
 }
 
 }  // namespace bookmarks