Change URL back to the previous one if the typed URL causes file download.

chrome/browser/tab_contents/tab_contents.cc

 // Copyright (c) 2009 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 "chrome/browser/tab_contents/tab_contents.h"
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/file_version_info.h"
 #include "base/process_util.h"
@@ skipping 880 matching lines @@
 }
 
 void TabContents::OnStartDownload(DownloadItem* download) {
   DCHECK(download);
 
   // Download in a constrained popup is shown in the tab that opened it.
   TabContents* tab_contents = delegate()->GetConstrainingContents(this);
 
   if (tab_contents && tab_contents->delegate())
     tab_contents->delegate()->OnStartDownload(download);
+
+  // Update the URL display.
+  // If the download is caused by typing in a downloadable URL, e.g.,
+  // http://example.com/somefile.zip, into the omnibox, the previous URL
+  // will reappear.
+  if (delegate())
+    delegate()->NavigationStateChanged(this, TabContents::INVALIDATE_URL);
 }
 
 void TabContents::WillClose(ConstrainedWindow* window) {
   ConstrainedWindowList::iterator it =
       find(child_windows_.begin(), child_windows_.end(), window);
   if (it != child_windows_.end())
     child_windows_.erase(it);
 }
 
 void TabContents::WillCloseBlockedPopupContainer(
@@ skipping 1423 matching lines @@
       NavigationController::LoadCommittedDetails& committed_details =
           *(Details<NavigationController::LoadCommittedDetails>(details).ptr());
       ExpireInfoBars(committed_details);
       break;
     }
 
     default:
       NOTREACHED();
   }
 }