Remove Mojo JS leak suppression
Remove Mojo JS leak suppression

Can't repro this locally so maybe it's fixed. If not,
at least we can gather some new logs, as the ones in
the bug are no longer available.

BUG=600484
TBR=jyasskin@chromium.org

Review-Url: https://codereview.chromium.org/1977253002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#393766}

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