Made CHostControl use atomic reference counting because it is accessed from StreamOperation threads.
Made CHostControl use atomic reference counting because it is accessed from StreamOperation threads.

Review URL: http://codereview.chromium.org/151096

git-svn-id: http://src.chromium.org/svn/trunk/src@19635 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 49f43d3b98fbaf5621082ab96ae7a32e600583c8
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