remove reliance on webcontents when requesting storage permission

chrome/browser/download/download_resource_throttle.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/download/download_resource_throttle.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "build/build_config.h"
@@ skipping 33 matching lines @@
     CanDownload(std::move(info));
   else
     info->continue_callback.Run(false);
 }
 #endif
 
 void CanDownloadOnUIThread(
     std::unique_ptr<DownloadResourceThrottle::DownloadRequestInfo> info) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 #if defined(OS_ANDROID)
-  content::WebContents* contents = info->web_contents_getter.Run();
-  if (contents) {
-    DownloadControllerBase::Get()->AcquireFileAccessPermission(
-        contents, base::Bind(&OnAcquireFileAccessPermissionDone,
-                             base::Passed(std::move(info))));
-  } else {
-    OnAcquireFileAccessPermissionDone(std::move(info), false);
-  }
+  DownloadControllerBase::Get()->AcquireFileAccessPermission(
+      info->web_contents_getter, base::Bind(&OnAcquireFileAccessPermissionDone,
+                                            base::Passed(std::move(info))));
 #else
   CanDownload(std::move(info));
 #endif
 }
 
 }  // namespace
 
 DownloadResourceThrottle::DownloadRequestInfo::DownloadRequestInfo(
     scoped_refptr<DownloadRequestLimiter> limiter,
     const content::ResourceRequestInfo::WebContentsGetter& web_contents_getter,
@@ skipping 77 matching lines @@
 
   if (request_deferred_) {
     request_deferred_ = false;
     if (allow) {
       Resume();
     } else {
       Cancel();
     }
   }
 }