plugins/update-widgets-crash.html victim element goes missing
plugins/update-widgets-crash.html victim element goes missing

The victim element to be removed is non-existant sometimes after the bugs
listed resolved. Workaround for now, by testing that the "victim" element
exists to avoid an exception, which causes extra test console output, and
fails the test. See issue 476590 #46 for a bot failure example.

TBR=haraken@chromium.org
BUG=457054, 476590
NOTRY=true

Review URL: https://codereview.chromium.org/1122483002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@194807 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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