Don't navigate TestShell page to about:blank if it's devtools frontend because it is supposed to load only devtools frontend page and only once.
Don't navigate TestShell page to about:blank if it's devtools frontend because it is supposed to load only devtools frontend page and only once.

Review URL: http://codereview.chromium.org/1600007

git-svn-id: http://src.chromium.org/svn/trunk/src@43471 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a21721295a63e5e819b55e338c5742d7b9f03149
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