This reverts commit 17ef406d.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> [heap] Add histogram counter for young generation handling
> 
> BUG=chromium:693413
> 
> Change-Id: I6c6bc62e7f2c702be2462e4b0c3704fabf44f9d2
> Reviewed-on: https://chromium-review.googlesource.com/445156
> Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#43316}

TBR=ulan@chromium.org,mlippautz@chromium.org,hpayer@chromium.org,v8-reviews@googlegroups.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:693413

Change-Id: I38b293d6594278370ec0c5cb20234811b48086f6
Reviewed-on: https://chromium-review.googlesource.com/445179
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43331}