Add chrome://tcmalloc/ to list of WebUI URLs
Add chrome://tcmalloc/ to list of WebUI URLs

R=isherman@chromium.org
BUG=none

Review URL: https://codereview.chromium.org/1460643002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#360479}

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