fix check object when extends, with some navigator or some toolkit (GWT) instance of failed.
fix check object when extends, with some navigator or some toolkit (GWT) instance of failed.

MrSwitch/hello.js,flybaseio/hello.js,flybaseio/hello.js,MrSwitch/hello.js,SoSocio/hello.js,rkorn86/hello.js,flybaseio/hello.js,rkorn86/hello.js,rkorn86/hello.js,SoSocio/hello.js,MrSwitch/hello.js,SoSocio/hello.js