Remove RenderThreadImpl::DoNotSuspendWebKitSharedTimer

Remove RenderThreadImpl::DoNotSuspendWebKitSharedTimer

Shared timers are explicitly suppressed when sending a sync IPC that
runs a nested message loop. Historically, there was an affordance for
avoiding this suppression, but it appears that is no longer necessary.
Remove RenderThreadImpl::DoNotSuspendWebKitSharedTimer accordingly.

BUG=none

Committed: https://crrev.com/d73ae541700c2659c79409d937a9fd531c5d5d46
Cr-Commit-Position: refs/heads/master@{#329225}

[jdduke (slow), 2015-05-08 21:03:17]

Patchset #1 (id:1) has been deleted

[jdduke (slow), 2015-05-11 15:15:03]

jdduke@chromium.org changed reviewers:
+ sievers@chromium.org

[jdduke (slow), 2015-05-11 15:15:04]

sievers@, PTAL, appears this method is no longer used and just adds complexity.

[no sievers, 2015-05-11 19:16:46]

LGTM

[jdduke (slow), 2015-05-11 20:02:40]

The CQ bit was checked by jdduke@chromium.org

[commit-bot: I haz the power, 2015-05-11 20:03:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1132913002/40001

[commit-bot: I haz the power, 2015-05-11 20:07:27]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2015-05-11 20:08:23]

Patchset 2 (id:??) landed as
https://crrev.com/d73ae541700c2659c79409d937a9fd531c5d5d46
Cr-Commit-Position: refs/heads/master@{#329225}