Navigate to "about:blank" before calling GC so that the current page does not hold references to DOM objects.
Navigate to "about:blank" before calling GC so that the current
page does not hold references to DOM objects.

This should reduce noise of reporting leaked nodes.

Review URL: http://codereview.chromium.org/12936

git-svn-id: http://src.chromium.org/svn/trunk/src@6377 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 406ff9cb3f593dde1625915f3f04b18d007f6083
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