Race condition in component_updater::BackgroundDowloader (follow up)

chrome/browser/component_updater/background_downloader_win.h

Index: chrome/browser/component_updater/background_downloader_win.h
diff --git a/chrome/browser/component_updater/background_downloader_win.h b/chrome/browser/component_updater/background_downloader_win.h
index 9d11a5d268f67ea271cd382a1a24311b86fad3ea..d1a08f8469b001b2d039a747e24662e98f5e9fb9 100644
--- a/chrome/browser/component_updater/background_downloader_win.h
+++ b/chrome/browser/component_updater/background_downloader_win.h
@@ -36,6 +36,9 @@ class BackgroundDownloader : public CrxDownloader {
 
   // Called asynchronously on the FILE thread at different stages during
   // the download. |OnDownloading| can be called multiple times.
+  // |EndDownload| switches the execution flow from the FILE to the UI thread.
+  // Accessing any data members of this object on the FILE thread after
+  // calling |EndDownload| is unsafe.
   void BeginDownload(const GURL& url);
   void OnDownloading();
   void EndDownload(HRESULT hr);