Revert "Fix "CSSMin url() value remapping not working in certain obscure cases""

This reverts commit fa1053a16a5b3ff2004f6c06c69e87f8570a35d7.

Breaks CSS output, making the skin and extensions look unstyled.

Change-Id: I297150f775dd5559f91f2c9c25c64b134459c6b6
Merge "Revert "Fix "CSSMin url() value remapping not working in certain obscure cases"""