Revert "Add svg version of bullet-icon"

The generated CSS is invalid, as you can't have multiple
list-style-images (unlike background-images). Browsers
either ignore the invalid properties with linear-gradient
and use non-embedded PNG fallback (Chrome, Firefox, modern
IE), or accept the properties but ignore everything after
the comma, using the fully transparent gradient (Opera). 

This reverts commit 32e65050a6351bd93175bf10b0c0a23834a16c37.

Change-Id: I46abf1502c1e4e3dfe03f0c17c553b9fe7fe007d