Fix potential crash in Browser::OpenURLAtIndex.
Fix potential crash in Browser::OpenURLAtIndex.

This is a bit of a Coverity nit, but if disposition
SUPPRESS_OPEN is ever passed in to this function,
it will crash because we try to call Focus on a
new_contents pointer that is null. I verified this
by hard coding the disposition as we open URLs.

BUG=17101
TEST=No significant change.

Review URL: http://codereview.chromium.org/155773

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@23532 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