[Mac] Cmd-Return in the omnibox should revert the omnibox text back to its or...

chrome/browser/autocomplete/autocomplete_edit_view_mac.mm

Index: chrome/browser/autocomplete/autocomplete_edit_view_mac.mm
===================================================================
--- chrome/browser/autocomplete/autocomplete_edit_view_mac.mm	(revision 29719)
+++ chrome/browser/autocomplete/autocomplete_edit_view_mac.mm	(working copy)
@@ -825,6 +825,11 @@
     WindowOpenDisposition disposition =
         event_utils::WindowOpenDispositionFromNSEvent(event);
     edit_view_->AcceptInput(disposition, false);
+    // Opening a URL in a background tab should also revert the omnibox contents
+    // to their original state.  We cannot do a blanket revert in OpenURL()
+    // because middle-clicks also open in a new background tab, but those should
+    // not revert the omnibox text.
+    edit_view_->RevertAll();
     return YES;
   }