Turn on flag for Linux, too.
Turn on flag for Linux, too.

BUG=none
TEST=check about:flags on Linux for Enable Cloud Print Proxy.

Review URL: http://codereview.chromium.org/6624021

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@76951 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