Revert of Wait 60s instead of 30s for browser to launch.

Revert of Wait 60s instead of 30s for browser to launch. (patchset #1 id:1 of https://codereview.chromium.org/691683002/)

Reason for revert:
Didn't help -- stuck subprocesses are still showing up.

Original issue's description:
> Wait 60s instead of 30s for browser to launch.
>
> There's a guess that the browser may be launching extremely slowly on
> some bots and that when the browser main process is killed it's
> leaking sub-processes that are in the middle of being spawned.
> Increase the timeout to try to confirm this hypothesis.
>
> BUG=424024
> R=tonyg@chromium.org
>
> Committed: https://crrev.com/7ef2c0036f70bdcc59dd7c8f23c8b7c5a3f114d9
> Cr-Commit-Position: refs/heads/master@{#302087}

TBR=tonyg@chromium.org,nednguyen@google.com
NOTREECHECKS=true
NOTRY=true
BUG=424024
Committed: https://crrev.com/c598228e3ae5d364aeaf9889754f3f4b132815e2
Cr-Commit-Position: refs/heads/master@{#302128}

[Ken Russell (switch to Gerrit), 2014-10-30 19:17:49]

Created Revert of Wait 60s instead of 30s for browser to launch.

[commit-bot: I haz the power, 2014-10-30 19:19:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/667733004/1

[commit-bot: I haz the power, 2014-10-30 19:21:08]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-30 19:22:26]

Patchset 1 (id:??) landed as
https://crrev.com/c598228e3ae5d364aeaf9889754f3f4b132815e2
Cr-Commit-Position: refs/heads/master@{#302128}