tools/battor_agent: Adds forgotten DISALLOW_COPY... to sample converter
tools/battor_agent: Adds forgotten DISALLOW_COPY... to sample converter

TBR=zhenw@chromium.org,nednguyen@google.com
BUG=542837

Review URL: https://codereview.chromium.org/1658813002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#372787}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk