Fixes bug in test_shell on linux. When closing the window we can get notification of focus changes after the WebWidgetHost has been deleted, resulting in a crash.
Fixes bug in test_shell on linux. When closing the window we can get
notification of focus changes after the WebWidgetHost has been
deleted, resulting in a crash.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/255046

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@27778 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