Revert of Update V8 to version 4.6.66. (patchset #1 id:1 of https://codereview.chromium.org/1283043002/ )
Revert of Update V8 to version 4.6.66. (patchset #1 id:1 of https://codereview.chromium.org/1283043002/ )

Reason for revert:
Failing gyp on win x64.

http://build.chromium.org/p/chromium.win/builders/Win%20x64%20Builder/builds/12672

FAILED: C:\b\depot_tools\python276_bin\python.exe gyp-win-tool action-wrapper environment.x64 v8_external_snapshot_target_run_mksnapshot__external__93bfc5871b63718af434b4cbb478e06a..rsp ..\..\v8\tools\gyp

Original issue's description:
> Update V8 to version 4.6.66.
>
> Summary of changes available at:
> https://chromium.googlesource.com/v8/v8/+log/1d0b8962..e348bba6
>
> Please follow these instructions for assigning/CC'ing issues:
> https://code.google.com/p/v8-wiki/wiki/TriagingIssues
>
> Please close rolling in case of a roll revert:
> https://v8-roll.appspot.com/
>
> TBR=hablich@chromium.org,machenbach@chromium.org,yangguo@chromium.org,vogelheim@chromium.org
>
> Committed: https://crrev.com/0ec1cd853c92087053606929e6836fc5e5a49c50
> Cr-Commit-Position: refs/heads/master@{#342875}

TBR=hablich@chromium.org,machenbach@chromium.org,vogelheim@chromium.org,yangguo@chromium.org,v8-autoroll@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1291493002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#342881}

CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend