Do not apply gzip filter to file names with gz/tgz/svgz extensions.
Do not apply gzip filter to file names with gz/tgz/svgz extensions.

This matches Firefox's behavior.

BUG=8170
Review URL: http://codereview.chromium.org/42452

git-svn-id: http://src.chromium.org/svn/trunk/src@12467 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 436b879060cfdd9af0d71a7c10b22118850af643
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser