[html-tests] Remove duplicated and broken tests for src attribute removal (#638)

This is tested loading-the-media-resource/020.html with much less code.

Also, neither of the removed tests actually work, a local Blink build
where removing the src attribute does invoke resource selection still
passes both tests.

View on GitHub: https://github.com/w3c/web-platform-tests/pull/638

Received on Sunday, 16 February 2014 14:24:56 UTC