Fix handling of tests that fail two different ways in run-webkit-tests (buildbot side).

This is a follow-on to r159630. It turns out I wasn't covering the
case where a test fails two different ways, and the second failure
is actually an expected failure.

TBR=ilevy@chromium.org, ojan@chromium.org
BUG=307277

Review URL: https://codereview.chromium.org/26110008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230204 0039d316-1c4b-4281-b951-d872f2087c98
Remove the last RenderViewHostObserver in chrome by using a WebContentsObserver instead.

BUG=306569
R=avi@chromium.org

Review URL: https://codereview.chromium.org/34523005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230205 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230205