GTTF: Terminate chrome processes in UI test in a more reliable way.
GTTF: Terminate chrome processes in UI test in a more reliable way.

The previous code would never issue SIGKILL on POSIX.
If the browser is severly hung, we actually need to kill it.

Otherwise we leak a process and it hoses our build bots.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/3501008

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@60623 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