Revert of [heap] Concurrency support for heap book-keeping info

Revert of [heap] Concurrency support for heap book-keeping info (patchset #4 id:60001 of https://codereview.chromium.org/1340923004/ )

Reason for revert:
crashing: http://build.chromium.org/p/client.v8/builders/V8%20Win32%20-%20debug%20-%203/builds/4716

Original issue's description:
> [heap] Concurrency support for heap book-keeping info.
>
> Adds concurrency support for:
> - MemoryChunk: Fragmentation counters
> - MemoryChunk: High-water mark
> - MemoryAllocator: Lowest and highest ever allocated addresses, size, and
>   capacity
>
> [email protected]
> BUG=chromium:524425
> LOG=N
>
> Committed: https://crrev.com/63190721cda4966e01d71e92a730ce48ea789fbc
> Cr-Commit-Position: refs/heads/master@{#30749}

[email protected]
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:524425
Committed: https://crrev.com/0db34dbe8111f8670c82bb4c42110400a9050d08
Cr-Commit-Position: refs/heads/master@{#30752}

[Michael Lippautz, 2015-09-15 15:11:20]

Created Revert of [heap] Concurrency support for heap book-keeping info

[commit-bot: I haz the power, 2015-09-15 15:11:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1340323002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1340323002/1

[commit-bot: I haz the power, 2015-09-15 15:11:43]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-15 15:11:57]

Patchset 1 (id:??) landed as
https://crrev.com/0db34dbe8111f8670c82bb4c42110400a9050d08
Cr-Commit-Position: refs/heads/master@{#30752}