Revert "uglifyjs support for source map contents"
Revert "uglifyjs support for source map contents"

This reverts commit 13ff32d4493505816fd420f389489b279550d86f.

jrauschenbusch/builder,systemjs/builder,lookfirst/builder,systemjs/builder,whitneyit/builder,whitneyit/builder,jrauschenbusch/builder,alexisvincent/builder,lookfirst/builder,systemjs/builder,jrauschenbusch/builder,alexisvincent/builder,alexisvincent/builder