Check that the crash service is available and warn if not
Check that the crash service is available and warn if not

BUG=none
R=dpranke@chromium.org

Review URL: https://codereview.chromium.org/61643002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@161452 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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