coverity: Pass strings by reference.
coverity: Pass strings by reference.

CID=5738
BUG=none
TEST=none
Review URL: http://codereview.chromium.org/165486

git-svn-id: http://src.chromium.org/svn/trunk/src@23381 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 600293d76dc52a746078ce155da7114a7a59e358
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