Switch SupportsUserData uses to use unique_ptr.

chrome/browser/extensions/webstore_installer.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/extensions/webstore_installer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <limits>
 #include <set>
@@ skipping 478 matching lines @@
     // We are downloading a shared module. We need create an approval for it.
     std::unique_ptr<Approval> approval =
         Approval::CreateForSharedModule(profile_);
     const SharedModuleInfo::ImportInfo& info = pending_modules_.front();
     approval->extension_id = info.extension_id;
     const base::Version version_required(info.minimum_version);
 
     if (version_required.IsValid()) {
       approval->minimum_version.reset(new base::Version(version_required));
     }
-    download_item_->SetUserData(kApprovalKey, approval.release());
+    download_item_->SetUserData(kApprovalKey, std::move(approval));
   } else {
     // It is for the main module of the extension. We should use the provided
     // |approval_|.
     if (approval_)
-      download_item_->SetUserData(kApprovalKey, approval_.release());
+      download_item_->SetUserData(kApprovalKey, std::move(approval_));
   }
 
   if (!download_started_) {
     if (delegate_)
       delegate_->OnExtensionDownloadStarted(id_, download_item_);
     download_started_ = true;
   }
 }
 
 void WebstoreInstaller::OnDownloadUpdated(DownloadItem* download) {
@@ skipping 275 matching lines @@
         1,
         kMaxSizeKb,
         kNumBuckets);
   }
   UMA_HISTOGRAM_BOOLEAN(
       "Extensions.WebstoreDownload.InterruptTotalSizeUnknown",
       total_bytes <= 0);
 }
 
 }  // namespace extensions