Revert of [es6] Fix scoping for default parameters in arrow functions

Revert of [es6] Fix scoping for default parameters in arrow functions (patchset #5 id:80001 of https://codereview.chromium.org/1405313002/ )

Reason for revert:
Breaks nosnap: http://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20nosnap%20-%20debug%20-%202/builds/2407/steps/Check/logs/regress-4395

Original issue's description:
> [es6] Fix scoping for default parameters in arrow functions
>
> When eagerly parsing arrow functions, expressions in default
> parameter initializers are parsed in the enclosing scope,
> rather than in the function's scope (since that scope does not
> yet exist). This leads to VariableProxies being added to the
> wrong scope, and scope chains for FunctionLiterals being incorrect.
>
> This patch addresses these problems by adding a subclass of
> AstExpressionVisitor that moves VariableProxies to the proper
> scope and fixes up scope chains of FunctionLiterals.
>
> More work likely still needs to be done to make this work completely,
> but it's very close to correct.
>
> BUG=v8:4395
> LOG=y
>
> Committed: https://crrev.com/cf72aad39e51de9b7074ea039377c1812f4a2c6b
> Cr-Commit-Position: refs/heads/master@{#31402}

TBR=rossberg@chromium.org,caitpotter88@gmail.com,adamk@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4395
Committed: https://crrev.com/e41614a058426fb6102e4ab2dd4f98997f00c0fc
Cr-Commit-Position: refs/heads/master@{#31404}

[Benedikt Meurer, 2015-10-20 10:35:59]

Created Revert of [es6] Fix scoping for default parameters in arrow functions

[commit-bot: I haz the power, 2015-10-20 10:36:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1417463004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1417463004/1

[commit-bot: I haz the power, 2015-10-20 10:36:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-20 10:36:46]

Patchset 1 (id:??) landed as
https://crrev.com/e41614a058426fb6102e4ab2dd4f98997f00c0fc
Cr-Commit-Position: refs/heads/master@{#31404}