Make nsIFileURL scriptable and QueryInterfaceable. fix bug #34335 and 34328 and 34470. Minor cleanups on unix file picker dialog

suite/browser/navigator.js

@@ -714,12 +714,8 @@ function RevealSearchPanel()
       fp.init(window, bundle.GetStringFromName("openFile"), nsIFilePicker.modeOpen);
       fp.setFilters(nsIFilePicker.filterAll);
       fp.show();
-      
-      // Hack to get a file: url from an nsIFile
-      var tempFileSpec = Components.classes["component://netscape/filespec"].createInstance(Components.interfaces.nsIFileSpec);
-      tempFileSpec.nativePath = fp.file.path;
-      
-      openNewWindowWith(tempFileSpec.URLString);
+
+      openNewWindowWith(fp.fileURL.spec);
     } catch (ex) { }
   }