Revert of Make V8 extras a separate type of native

Revert of Make V8 extras a separate type of native (patchset #4 id:60001 of https://codereview.chromium.org/1129743003/)

Reason for revert:
https://build.chromium.org/p/client.v8/builders/V8-Blink%20Linux%2064%20%28dbg%29/builds/2745

Original issue's description:
> Make V8 extras a separate type of native
>
> Instead of making them an extra option that gets passed in and compiled
> at the end of the natives file for a given run of js2c, we now make them a
> separate run of js2c with a separate natives file output.
>
> This natives file output is then compiled in the bootstrapper. It is not part
> of the snapshot (yet), but instead is treated similar to the experimental
> natives, just without any of the complexity that comes from tieing the
> behavior to flags. We also don't add counterparts to
> InitializeExperimentalGlobal and InstallExperimentalNativeFunctions, yet.
>
> R=yangguo@chromium.org, jochen@chromium.org
> BUG=
>
> Committed: https://crrev.com/c93aff4ac63ad9ffb6318e750335208de32b7902
> Cr-Commit-Position: refs/heads/master@{#28296}

TBR=jochen@chromium.org,yangguo@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/010c515d0fb78e06803cb0293aefe58f755ef646
Cr-Commit-Position: refs/heads/master@{#28299}

[domenic, 2015-05-07 14:09:21]

Created Revert of Make V8 extras a separate type of native

[commit-bot: I haz the power, 2015-05-07 14:09:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1131903002/1

[commit-bot: I haz the power, 2015-05-07 14:09:39]

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

[commit-bot: I haz the power, 2015-05-07 14:09:40]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Michael Achenbach, 2015-05-07 14:26:07]

machenbach@chromium.org changed reviewers:
+ machenbach@chromium.org

[Michael Achenbach, 2015-05-07 14:26:07]

lgtm

[Michael Achenbach, 2015-05-07 14:26:11]

The CQ bit was checked by machenbach@chromium.org

[commit-bot: I haz the power, 2015-05-07 14:26:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1131903002/1

[commit-bot: I haz the power, 2015-05-07 14:26:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-07 14:27:01]

Patchset 1 (id:??) landed as
https://crrev.com/010c515d0fb78e06803cb0293aefe58f755ef646
Cr-Commit-Position: refs/heads/master@{#28299}