Revert "[webcomponentsjs] Adds new build target to facilitate easier testing"
Revert "[webcomponentsjs] Adds new build target to facilitate easier testing"

This reverts commit 5e7212693eb4f2bdc1b06a5b2df1c0b35ac11290.

webcomponents/polyfills,webcomponents/polyfills,webcomponents/polyfills