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: http://src.chromium.org/svn/trunk/src@27778 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 6a6d450615cc25624bdcd3561cb406833d76eb98
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