Revert 275819 "Add libxslt to the GN build"

Revert 275819 "Add libxslt to the GN build"

This is causing compile failure on the Android build:
http://build.chromium.org/p/chromium.linux/buildstatus?builder=Android%20GN&number=3401

> Add libxslt to the GN build
> 
> BUG=
> R=scottmg@chromium.org
> 
> Review URL: https://codereview.chromium.org/317253003

TBR=brettw@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=275822

[ccameron, 2014-06-09 16:59:54]

Committed patchset #1 manually as r275822 (tree was closed).

[brettw, 2014-06-09 17:04:07]

LGTM