[cleanup] Remove un-scoped ParseBlock from Parser

[cleanup] Remove un-scoped ParseBlock from Parser

Because the Scope will be optimized away by the call to
FinalizeBlockScope in the case where there are no lexical
declarations in the block, this should have no effect on
anything downstream from the Parser, and simply removes
duplicate parsing code.

Due to the change from ParseStatement to ParseStatementListItem,
this will result in slightly different error messages for
lexical declarations in sloppy mode (until those are shipped).

R=littledan@chromium.org, rossberg@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel

Committed: https://crrev.com/b0b97da506fb26a2de553bcabccfa8c2512c0e39
Cr-Commit-Position: refs/heads/master@{#31966}

[adamk, 2015-11-10 19:35:03]

The CQ bit was checked by adamk@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-11-10 19:35:10]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1433743005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1433743005/1

[commit-bot: I haz the power, 2015-11-10 19:47:05]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-10 19:47:05]

Dry run: Try jobs failed on following builders:
  v8_mac_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel/builds/11701)

[adamk, 2015-11-10 19:55:12]

The CQ bit was checked by adamk@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-11-10 19:55:23]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1433743005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1433743005/20001

[commit-bot: I haz the power, 2015-11-10 21:54:00]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-10 21:54:01]

Dry run: This issue passed the CQ dry run.

[rossberg, 2015-11-12 16:39:29]

LGTM. I suppose the separation was more a premature optimisation than anything
else.

[adamk, 2015-11-12 16:40:20]

The CQ bit was checked by adamk@chromium.org

[commit-bot: I haz the power, 2015-11-12 16:40:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1433743005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1433743005/20001

[commit-bot: I haz the power, 2015-11-12 17:41:34]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-11-14 23:20:55]

Patchset 2 (id:??) landed as
https://crrev.com/b0b97da506fb26a2de553bcabccfa8c2512c0e39
Cr-Commit-Position: refs/heads/master@{#31966}