ng: fix iframe plugin rendering (#3739)
ng: fix iframe plugin rendering (#3739)

Angular, by default, encapsulates styling using some component specific
hash attached to the DOM when stamping them. Unfortunately, the iframe
is not created by Angular, thus, need to be styled a bit differently.

This change allows iframe to be styled without the hash stamped out.
tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard