Remove "using namespace std" which is illegal per style guide.
Remove "using namespace std" which is illegal per style guide.

Also remove the other using directives, most of which were already explicitly qualified at various places in the file anyway.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/4660009

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@65618 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