Simplify DownloadRequestHandle by using WebContentsGetter

content/browser/download/download_resource_handler.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 "content/browser/download/download_resource_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 77 matching lines @@
       tab_info_(new DownloadTabInfo()),
       core_(request, this) {
   // Do UI thread initialization for tab_info_ asap after
   // DownloadResourceHandler creation since the tab could be navigated
   // before StartOnUIThread gets called.  This is safe because deletion
   // will occur via PostTask() as well, which will serialized behind this
   // PostTask()
   const ResourceRequestInfoImpl* request_info = GetRequestInfo();
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
-      base::Bind(&InitializeDownloadTabInfoOnUIThread,
-                 DownloadRequestHandle(AsWeakPtr(), request_info->GetChildID(),
-                                       request_info->GetRouteID(),
-                                       request_info->GetRequestID(),
-                                       request_info->frame_tree_node_id()),
-                 tab_info_.get()));
+      base::Bind(
+          &InitializeDownloadTabInfoOnUIThread,
+          DownloadRequestHandle(AsWeakPtr(),
+                                request_info->GetWebContentsGetterForRequest()),
+          tab_info_.get()));
 }
 
 DownloadResourceHandler::~DownloadResourceHandler() {
   if (tab_info_) {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&DeleteOnUIThread, base::Passed(&tab_info_)));
   }
 }
 
@@ skipping 67 matching lines @@
           BrowserThread::UI, FROM_HERE,
           base::Bind(callback, nullptr, create_info->result));
     return;
   }
 
   const ResourceRequestInfoImpl* request_info = GetRequestInfo();
   create_info->has_user_gesture = request_info->HasUserGesture();
   create_info->transition_type = request_info->GetPageTransition();
 
   create_info->request_handle.reset(new DownloadRequestHandle(
-      AsWeakPtr(), request_info->GetChildID(), request_info->GetRouteID(),
-      request_info->GetRequestID(), request_info->frame_tree_node_id()));
+      AsWeakPtr(), request_info->GetWebContentsGetterForRequest()));
 
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&StartOnUIThread, base::Passed(&create_info),
                  base::Passed(&tab_info_), base::Passed(&stream_reader),
                  callback));
 }
 
 void DownloadResourceHandler::OnReadyToRead() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
@@ skipping 22 matching lines @@
                             " }",
                             request() ?
                                 request()->url().spec().c_str() :
                                 "<NULL request>",
                             info->GetChildID(),
                             info->GetRequestID(),
                             info->GetRouteID());
 }
 
 }  // namespace content