Use the theme ID as as the cache-buster, making subsequent NNTP loads much faster.
Use the theme ID as as the cache-buster, making subsequent NNTP loads much faster.

BUG=18427
TEST=Install a few themes, verify that the NNTP never gets out of sync with the installed theme.

Review URL: http://codereview.chromium.org/159900

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@22462 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser