Convert Pass()→std::move() for Mac build.

chrome/browser/plugins/plugin_installer_unittest.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 "chrome/browser/plugins/plugin_installer.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/run_loop.h"
 #include "chrome/browser/plugins/plugin_installer_observer.h"
 #include "chrome/test/base/chrome_render_view_host_test_harness.h"
@@ skipping 33 matching lines @@
   installer_.reset();
   content::RenderViewHostTestHarness::TearDown();
 }
 
 scoped_ptr<content::MockDownloadItem>
 PluginInstallerTest::CreateMockDownloadItem() {
   scoped_ptr<content::MockDownloadItem> mock_download_item(
       new testing::StrictMock<content::MockDownloadItem>());
   ON_CALL(*mock_download_item, GetState())
       .WillByDefault(testing::Return(content::DownloadItem::IN_PROGRESS));
-  return mock_download_item.Pass();
+  return mock_download_item;
 }
 
 class TestPluginInstallerObserver : public PluginInstallerObserver {
  public:
   explicit TestPluginInstallerObserver(PluginInstaller* installer)
       : PluginInstallerObserver(installer),
         download_started_(false),
         download_finished_(false),
         download_cancelled_(false) {}
 
@@ skipping 115 matching lines @@
   EXPECT_CALL(*download_item, GetState())
       .WillOnce(testing::Return(content::DownloadItem::INTERRUPTED));
   EXPECT_CALL(*download_item, GetLastReason()).WillOnce(
       testing::Return(content::DOWNLOAD_INTERRUPT_REASON_NETWORK_FAILED));
   download_item->NotifyObserversDownloadUpdated();
 
   EXPECT_TRUE(installer_observer.download_started());
   EXPECT_FALSE(installer_observer.download_finished());
   EXPECT_EQ("NETWORK_FAILED", installer_observer.download_error());
 }