Add control to use If-Range header for range request.

content/public/browser/download_url_parameters.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/public/browser/download_url_parameters.h"
 
 #include "base/callback.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/download_save_info.h"
 #include "content/public/browser/render_frame_host.h"
@@ skipping 11 matching lines @@
     : DownloadUrlParameters(url, -1, -1, -1, url_request_context_getter) {
 }
 
 DownloadUrlParameters::DownloadUrlParameters(
     const GURL& url,
     int render_process_host_id,
     int render_view_host_routing_id,
     int render_frame_host_routing_id,
     net::URLRequestContextGetter* url_request_context_getter)
     : content_initiated_(false),
+      use_if_range_(true),
       method_("GET"),
       post_id_(-1),
       prefer_cache_(false),
       render_process_host_id_(render_process_host_id),
       render_view_host_routing_id_(render_view_host_routing_id),
       render_frame_host_routing_id_(render_frame_host_routing_id),
       url_request_context_getter_(url_request_context_getter),
       url_(url),
       do_not_prompt_for_login_(false) {}
 
 DownloadUrlParameters::~DownloadUrlParameters() {
 }
 
 // static
 std::unique_ptr<DownloadUrlParameters>
 DownloadUrlParameters::CreateForWebContentsMainFrame(
     WebContents* web_contents,
     const GURL& url) {
   RenderFrameHost* render_frame_host = web_contents->GetMainFrame();
   StoragePartition* storage_partition = BrowserContext::GetStoragePartition(
       web_contents->GetBrowserContext(), render_frame_host->GetSiteInstance());
   return std::unique_ptr<DownloadUrlParameters>(new DownloadUrlParameters(
       url, render_frame_host->GetProcess()->GetID(),
       render_frame_host->GetRenderViewHost()->GetRoutingID(),
       render_frame_host->GetRoutingID(),
       storage_partition->GetURLRequestContext()));
 }
 
 }  // namespace content