Revert "Script streaming: Add an option to make the main thread block (wait for parsing)"

Revert "Script streaming: Add an option to make the main thread block (wait for parsing)"

This reverts r184277.

Reason: ASSERTS fail in debug mode because ScriptStreamer gets destroyed while
holding the mutex.

BUG=
TBR=marja@chromium.org, haraken@chromium.org
NOTRY=true

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184349

[marja, 2014-10-24 11:41:24]

marja@chromium.org changed reviewers:
+ haraken@chromium.org

[marja, 2014-10-24 11:41:25]

haraken, fyi, I'm reverting this; the mutex dance needs more massaging.

[marja, 2014-10-24 11:41:52]

The CQ bit was checked by marja@chromium.org

[commit-bot: I haz the power, 2014-10-24 11:42:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/680493002/1

[commit-bot: I haz the power, 2014-10-24 11:42:59]

Committed patchset #1 (id:1) as 184349

[haraken, 2014-10-24 13:30:15]

LGTM