Revert of cc: Make tile manager object persist for the length of LTHI.

Revert of cc: Make tile manager object persist for the length of LTHI. (patchset #4 id:60001 of https://codereview.chromium.org/1210073020/)

Reason for revert:
Causing memory issues: http://build.chromium.org/p/chromium.memory.fyi/builders/Chromium%20OS%20%28valgrind%29%284%29/builds/33411/steps/memory%20test%3A%20compositor/logs/stdio

Original issue's description:
> cc: Make tile manager object persist for the length of LTHI.
>
> This patch makes TileManager be persistent throughout LTHI instead of
> deleting and recreating it. This makes it possible to store items
> on it that don't have to go away (such as PictureLayerTilingSets for
> example).
>
> R=enne
> CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
>
> Committed: https://crrev.com/792592da64887fc81e99c6588ad1b98a153db7ea
> Cr-Commit-Position: refs/heads/master@{#337921}

TBR=enne@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/c38c8fa67ecac0cba567e4e159b6676b021c437f
Cr-Commit-Position: refs/heads/master@{#337944}

[vmpstr, 2015-07-08 23:52:04]

Created Revert of cc: Make tile manager object persist for the length of LTHI.

[commit-bot: I haz the power, 2015-07-08 23:53:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1227183002/1

[commit-bot: I haz the power, 2015-07-08 23:56:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-08 23:57:03]

Patchset 1 (id:??) landed as
https://crrev.com/c38c8fa67ecac0cba567e4e159b6676b021c437f
Cr-Commit-Position: refs/heads/master@{#337944}