ng: remove tf_web_libray target (#2524)
ng: remove tf_web_libray target (#2524)

This change removes the tf_web_library target from the tf_ng_tensorboard
to unblock google sync process.

Generally speaking, tf_web_library is an impediment in general to our
building/development cycle so we should reconsider using the
tf_web_library for angular source at all. We are currently thinking that
Angular source can depend on Polymer but Polymer cannot depend on
Angular.
tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard