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=yangguo@chromium.org, rossberg@chromium.org
LOG=N
BUG=

Committed: https://crrev.com/1efc1e4f7a3d30d5225e9d5cb2585cad7cb17099
Cr-Commit-Position: refs/heads/master@{#28458}

[wingo, 2015-05-18 14:40:40]

PTAL.  Patchset 1 is original patch as reverted.  Patchset 2 updates for super
spread calls, and fixes
http://code.google.com/p/chromium/issues/detail?id=487289.  I ended up using a
CatchContext to bind "this" as it was easiest.

[rossberg, 2015-05-18 16:31:55]

lgtm

[wingo, 2015-05-18 17:20:22]

The CQ bit was checked by wingo@igalia.com

[commit-bot: I haz the power, 2015-05-18 17:20:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1136883006/20001

[commit-bot: I haz the power, 2015-05-18 20:16:35]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-18 22:12:27]

Patchset 2 (id:??) landed as
https://crrev.com/1efc1e4f7a3d30d5225e9d5cb2585cad7cb17099
Cr-Commit-Position: refs/heads/master@{#28458}

[wingo, 2015-05-19 10:57:26]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/1146733002/ by wingo@igalia.com.

The reason for reverting is: Something is deserializing "this" declarations as
Variable::NORMAL and not Variable::THIS
https://codereview.chromium.org/1136123010/.