Don't destroy a request while it is being processed

chrome/browser/download/download_request_limiter.cc

Index: chrome/browser/download/download_request_limiter.cc
diff --git a/chrome/browser/download/download_request_limiter.cc b/chrome/browser/download/download_request_limiter.cc
index 0a828a14aaa008e5fea3ab59b9b6591b37f09729..579c172c490d53ab5ac4f69b881b4964f6d28af1 100644
--- a/chrome/browser/download/download_request_limiter.cc
+++ b/chrome/browser/download/download_request_limiter.cc
@@ -190,6 +190,7 @@ DownloadRequestLimiter::DownloadStatus
 
 void DownloadRequestLimiter::CanDownloadOnIOThread(int render_process_host_id,
                                                    int render_view_id,
+                                                   int request_id,
                                                    Callback* callback) {
   // This is invoked on the IO thread. Schedule the task to run on the UI
   // thread so that we can query UI state.
@@ -197,7 +198,8 @@ void DownloadRequestLimiter::CanDownloadOnIOThread(int render_process_host_id,
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       NewRunnableMethod(this, &DownloadRequestLimiter::CanDownload,
-                        render_process_host_id, render_view_id, callback));
+                        render_process_host_id, render_view_id, request_id,
+                        callback));
 }
 
 void DownloadRequestLimiter::OnUserGesture(TabContents* tab) {
@@ -233,6 +235,7 @@ DownloadRequestLimiter::TabDownloadState* DownloadRequestLimiter::
 
 void DownloadRequestLimiter::CanDownload(int render_process_host_id,
                                          int render_view_id,
+                                         int request_id,
                                          Callback* callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
@@ -243,16 +246,17 @@ void DownloadRequestLimiter::CanDownload(int render_process_host_id,
     ScheduleNotification(callback, false);
     return;
   }
-  CanDownloadImpl(originating_tab, callback);
+  CanDownloadImpl(originating_tab, request_id, callback);
 }
 
 void DownloadRequestLimiter::CanDownloadImpl(
     TabContents* originating_tab,
+    int request_id,
     Callback* callback) {
   // FYI: Chrome Frame overrides CanDownload in ExternalTabContainer in order
   // to cancel the download operation in chrome and let the host browser
   // take care of it.
-  if (!originating_tab->CanDownload(callback->GetRequestId())) {
+  if (!originating_tab->CanDownload(request_id)) {
     ScheduleNotification(callback, false);
     return;
   }