Added logic that exits message loop upon test ending even if no browser window exists.
Added logic that exits message loop upon test ending even if no browser
window exists.

BUG=None.
TEST=Run in process browser test that doesn't create browser window: it
should quit without timeout error.

Review URL: http://codereview.chromium.org/1508007

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@43085 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