Remove incorrect usage of AlertDialog.Builder.create

AlertDialog.Builder.show() will create an AlertDialog before it show. This is the source code snippet:

        /**
         * Creates a {@link AlertDialog} with the arguments supplied to this builder and
         * {@link Dialog#show()}'s the dialog.
         */
        public AlertDialog show() {
            AlertDialog dialog = create();
            dialog.show();
            return dialog;
        }

github: close #96

framework/src/org/apache/cordova/CordovaChromeClient.java

@@ -139,7 +139,6 @@ public class CordovaChromeClient extends WebChromeClient {
                     return true;
             }
         });
-        dlg.create();
         dlg.show();
         return true;
     }
@@ -188,7 +187,6 @@ public class CordovaChromeClient extends WebChromeClient {
                     return true;
             }
         });
-        dlg.create();
         dlg.show();
         return true;
     }
@@ -280,7 +278,6 @@ public class CordovaChromeClient extends WebChromeClient {
                             res.cancel();
                         }
                     });
-            dlg.create();
             dlg.show();
         }
         return true;