This reverts commit 8f4e8c0a.

Reason for revert: Speculative revert for http://crbug.com/717854

Original change's description:
> Fix runtime_call_stats for background parsing.
>
> BUG=v8:6093
>
> Change-Id: I365fbd7c3f33e2de47e0a84ee3ea631b4ffa6d35
> Reviewed-on: https://chromium-review.googlesource.com/488243
> Reviewed-by: Camillo Bruni <cbruni@chromium.org>
> Reviewed-by: Marja Hölttä <marja@chromium.org>
> Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
> Commit-Queue: Wiktor Garbacz <wiktorg@google.com>
> Cr-Commit-Position: refs/heads/master@{#45013}

TBR=marja@chromium.org
R=marja@chromium.org,vogelheim@chromium.org,cbruni@chromium.org,jochen@chromium.org
BUG=v8:6093,chromium:717854

Change-Id: Ia58a420ec4c1e84a9f01eb90545fabb0bc03aa63
Reviewed-on: https://chromium-review.googlesource.com/494568
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45070}