Fix test_shell to use the correct page ID for error pages.
Fix test_shell to use the correct page ID for error pages.

BUG=70315
TEST=Go back to a "confirm form resubmission" error, then forward.

Review URL: http://codereview.chromium.org/6286100

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@73827 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