Add flag to specify if explicitly requested download is from web.

content/browser/renderer_host/resource_dispatcher_host_impl.cc

Index: content/browser/renderer_host/resource_dispatcher_host_impl.cc
diff --git a/content/browser/renderer_host/resource_dispatcher_host_impl.cc b/content/browser/renderer_host/resource_dispatcher_host_impl.cc
index a74a4389b913e68f4470df548a5a18b74d656e3b..1896d0e7c79f9014323534704036d599df473242 100644
--- a/content/browser/renderer_host/resource_dispatcher_host_impl.cc
+++ b/content/browser/renderer_host/resource_dispatcher_host_impl.cc
@@ -466,6 +466,7 @@ void ResourceDispatcherHostImpl::CancelRequestsForContext(
 
 net::Error ResourceDispatcherHostImpl::BeginDownload(
     scoped_ptr<net::URLRequest> request,
+    bool from_web,
     ResourceContext* context,
     int child_id,
     int route_id,
@@ -514,8 +515,8 @@ net::Error ResourceDispatcherHostImpl::BeginDownload(
   // |started_callback|.
   scoped_refptr<ResourceHandler> handler(
       CreateResourceHandlerForDownload(request.get(), context, child_id,
-                                       route_id, request_id_, save_info,
-                                       started_callback));
+                                       route_id, request_id_, from_web,
+                                       save_info, started_callback));
 
   if (!request_context->job_factory()->IsHandledURL(url)) {
     VLOG(1) << "Download request for unsupported protocol: "
@@ -576,6 +577,7 @@ ResourceDispatcherHostImpl::CreateResourceHandlerForDownload(
     int child_id,
     int route_id,
     int request_id,
+    bool from_web,
     const DownloadSaveInfo& save_info,
     const DownloadResourceHandler::OnStartedCallback& started_cb) {
   scoped_refptr<ResourceHandler> handler(
@@ -585,7 +587,7 @@ ResourceDispatcherHostImpl::CreateResourceHandlerForDownload(
   if (delegate_) {
     ScopedVector<ResourceThrottle> throttles;
     delegate_->DownloadStarting(request, context, child_id, route_id,
-                                request_id, !request->is_pending(), &throttles);
+                                request_id, from_web, &throttles);
     if (!throttles.empty()) {
       handler = new ThrottlingResourceHandler(this, handler, child_id,
                                               request_id, throttles.Pass());