Reapply "Resolve references to "this" the same way as normal variables""

Reapply "Resolve references to "this" the same way as normal variables""

This reapplies https://codereview.chromium.org/1136073002, along with
the followups:

  Remove Scope::scope_uses_this_ flag
  https://codereview.chromium.org/1128963005

and

  PPC: Resolve references to "this" the same way as normal variables
  https://codereview.chromium.org/1134073003

R=rossberg@chromium.org
LOG=N
BUG=

Review URL: https://codereview.chromium.org/1136883006

Cr-Commit-Position: refs/heads/master@{#28458}

Committed: https://crrev.com/66665ae7274224ace841560462baee95ae3cc6cc
Cr-Commit-Position: refs/heads/master@{#28484}

[wingo, 2015-05-19 12:51:50]

Round and round we go!  Patchset 1 is patch as reverted; PS2 adds a slot to
ScopeInfo for scopes with a "this" binding so we can know what Variable::Kind to
use when deserializing "this" bindings, to fix the bug found in
http://code.google.com/p/chromium/issues/detail?id=487105.

[wingo, 2015-05-19 12:54:29]

The CQ bit was checked by wingo@igalia.com to run a CQ dry run

[commit-bot: I haz the power, 2015-05-19 12:54:36]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1140633003/20001

[commit-bot: I haz the power, 2015-05-19 13:19:15]

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

[commit-bot: I haz the power, 2015-05-19 13:19:17]

Dry run: This issue passed the CQ dry run.

[rossberg, 2015-05-19 14:28:55]

lgtm

[wingo, 2015-05-19 14:48:35]

The CQ bit was checked by wingo@igalia.com

[commit-bot: I haz the power, 2015-05-19 14:48:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1140633003/20001

[commit-bot: I haz the power, 2015-05-19 14:51:16]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-19 14:51:36]

Patchset 2 (id:??) landed as
https://crrev.com/66665ae7274224ace841560462baee95ae3cc6cc
Cr-Commit-Position: refs/heads/master@{#28484}