Modified cancel and interrupt processing to avoid race with history.

chrome/browser/download/download_history.cc

Index: chrome/browser/download/download_history.cc
diff --git a/chrome/browser/download/download_history.cc b/chrome/browser/download/download_history.cc
index 115541a4d24742ed52fa9ed9683f915109b60175..fc400309399b37db0630904a282ad9285b58c43c 100644
--- a/chrome/browser/download/download_history.cc
+++ b/chrome/browser/download/download_history.cc
@@ -120,14 +120,14 @@ void DownloadHistory::UpdateDownloadPath(DownloadItem* download_item,
     hs->UpdateDownloadPath(new_path, download_item->db_handle());
 }
 
-void DownloadHistory::RemoveEntry(DownloadItem* download_item) {
+void DownloadHistory::RemoveEntry(int64 db_handle) {
   // No update necessary if the download was initiated while in incognito mode.
-  if (download_item->db_handle() <= kUninitializedHandle)
+  if (db_handle <= kUninitializedHandle)
     return;
 
   HistoryService* hs = profile_->GetHistoryService(Profile::EXPLICIT_ACCESS);
   if (hs)
-    hs->RemoveDownload(download_item->db_handle());
+    hs->RemoveDownload(db_handle);
 }
 
 void DownloadHistory::RemoveEntriesBetween(const base::Time remove_begin,
@@ -141,6 +141,11 @@ int64 DownloadHistory::GetNextFakeDbHandle() {
   return next_fake_db_handle_--;
 }
 
+// static
+bool DownloadHistory::IsFakeHandle(int64 db_handle) {
+  return db_handle <= 0;
+}
+
 void DownloadHistory::OnGotVisitCountToHost(HistoryService::Handle handle,
                                             bool found_visits,
                                             int count,