Revert of Some linked_ptr removal in chromeos file_browser_handler.

chrome/browser/chromeos/extensions/file_manager/job_event_router_unittest.cc

 // Copyright 2015 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/chromeos/extensions/file_manager/job_event_router.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/macros.h"
-#include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace file_manager {
 namespace {
 
 class JobEventRouterImpl : public JobEventRouter {
  public:
   JobEventRouterImpl() : JobEventRouter(base::TimeDelta::FromMilliseconds(0)) {
     listener_extension_ids_.insert("extension_a");
   }
-  std::vector<std::unique_ptr<base::DictionaryValue>> events;
+  std::vector<linked_ptr<base::DictionaryValue>> events;
 
   void SetListenerExtensionIds(std::set<std::string> extension_ids) {
     listener_extension_ids_ = extension_ids;
   }
 
  protected:
   std::set<std::string> GetFileTransfersUpdateEventListenerExtensionIds()
       override {
     return listener_extension_ids_;
   }
 
   GURL ConvertDrivePathToFileSystemUrl(
       const base::FilePath& file_path,
       const std::string& extension_id) override {
     std::string url;
     url.append("filesystem:chrome-extension://");
     url.append(extension_id);
     url.append(file_path.value());
     return GURL(url);
   }
 
   void DispatchEventToExtension(
       const std::string& extension_id,
       extensions::events::HistogramValue histogram_value,
       const std::string& event_name,
       std::unique_ptr<base::ListValue> event_args) override {
     const base::DictionaryValue* event;
     event_args->GetDictionary(0, &event);
-    events.push_back(base::WrapUnique(event->DeepCopy()));
+    events.push_back(make_linked_ptr(event->DeepCopy()));
   }
 
  private:
   std::set<std::string> listener_extension_ids_;
 
   DISALLOW_COPY_AND_ASSIGN(JobEventRouterImpl);
 };
 
 class JobEventRouterTest : public testing::Test {
  protected:
@@ skipping 177 matching lines @@
   // Check event for extension_b.
   EXPECT_EQ("in_progress", GetEventString(1, "transferState"));
   EXPECT_EQ(0.0f, GetEventDouble(1, "processed"));
   EXPECT_EQ(100.0f, GetEventDouble(1, "total"));
   EXPECT_EQ("filesystem:chrome-extension://extension_b/test/a",
             GetEventString(1, "fileUrl"));
 }
 
 }  // namespace
 }  // namespace file_manager