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

chrome/browser/tab_contents/tab_contents.cc

Index: chrome/browser/tab_contents/tab_contents.cc
===================================================================
--- chrome/browser/tab_contents/tab_contents.cc	(revision 18607)
+++ chrome/browser/tab_contents/tab_contents.cc	(working copy)
@@ -898,6 +898,13 @@
 
   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) {