Revert of X87: Resolve references to "this" the same way as normal variables

Revert of X87: Resolve references to "this" the same way as normal variables

Reason for revert:

   original commit was reverted.

   This reverts commit c3529ce50158546e2f2c25ee888e7e0170a488f1.

   original issues's description:

   > X87: Resolve references to "this" the same way as normal variables
   >
   > port 06a792b7cc2db33ffce7244c044a9c05afbb6116 (r28263).
   >
   > original commit message:
   >
   >  Make the parser handle references to "this" as unresolved variables, so the
   >  same logic as for the rest of function parameters is used for the receiver.
   >  Minor additions to the code generation handle copying the receiver to the
   >  context, along with the rest of the function parameters.
   >
   >  Based on work by Adrian Perez de Castro <aperez@igalia.com>;

BUG=

Committed: https://crrev.com/93662ec2355995ba7a0c1f0c4828f93db2f3adaa
Cr-Commit-Position: refs/heads/master@{#28307}

[chunyang.dai, 2015-05-08 02:54:24]

chunyang.dai@intel.com changed reviewers:
+ weiliang.lin@intel.com

[chunyang.dai, 2015-05-08 02:54:24]

PTAL.

[Weiliang, 2015-05-08 03:35:36]

The CQ bit was checked by weiliang.lin@intel.com

[Weiliang, 2015-05-08 03:35:37]

lgtm

[commit-bot: I haz the power, 2015-05-08 03:35:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1130913005/1

[commit-bot: I haz the power, 2015-05-08 03:57:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-08 03:57:45]

Patchset 1 (id:??) landed as
https://crrev.com/93662ec2355995ba7a0c1f0c4828f93db2f3adaa
Cr-Commit-Position: refs/heads/master@{#28307}