Make win_clang_x64_dbg a non-experimental cq bot.
Make win_clang_x64_dbg a non-experimental cq bot.

The slaves are holiding up alright, and experimental bots get interrupted
frequently, so the data from the experiment isn't very reliable anyhow.

BUG=588518,552587
TBR=tandrii

Review URL: https://codereview.chromium.org/1820873003 .

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#382369}

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