Suppress UNINITIALIZED_READ in CSSVariableData
Suppress UNINITIALIZED_READ in CSSVariableData

BUG=591092
TBR=benwells@chromium.org

Review URL: https://codereview.chromium.org/1753833002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#378470}

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