No more crashes are seen in the RuntimeCallStats::Leave function. So
we can remove the debug info.

BUG=chromium:760649

Change-Id: If0a5f4ebf9ae359e3b8180ef2f8d37cab8659b06
Reviewed-on: https://chromium-review.googlesource.com/747483Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49091}