[telemetry] Don't allow negative settimeout values.
[telemetry] Don't allow negative settimeout values.

This is a speculative fix for the flaky exception here:
http://build.chromium.org/p/chromium.perf/builders/Win7%20GPU%20%28ATI%29%20Perf/builds/6413/steps/scrolling_benchmark/logs/stdio

BUG=None
TEST=Manual on linux

Review URL: https://codereview.chromium.org/11411045

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@168317 0039d316-1c4b-4281-b951-d872f2087c98

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