Set back StoreRef as non-thread-safe. (Second try)
Set back StoreRef as non-thread-safe. (Second try)

BUG=5689
Review URL: http://codereview.chromium.org/18367

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@8307 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