Update djblets for autoprefixer.
Review Request #8007 — Created Feb. 26, 2016 and submitted
This change switches out the few uses of custom methods for prefixed CSS rules
for the standard CSS equivalents, now that builds happen using autoprefixer.
Flipped around through the Review Board UI and saw that things looked correct.
Tool: PEP8 Style Checker Ignored Files: djblets/static/djblets/css/defs.less djblets/static/djblets/css/mixins/markdown.less djblets/static/djblets/css/config-forms.less Tool: Pyflakes Ignored Files: djblets/static/djblets/css/defs.less djblets/static/djblets/css/mixins/markdown.less djblets/static/djblets/css/config-forms.less