Revert of Revert of Update V8 to version 4.5.70. (patchset #1 id:1 of https://codereview.chromium.org/1201493003/)
Revert of Revert of Update V8 to version 4.5.70. (patchset #1 id:1 of https://codereview.chromium.org/1201493003/)

Reason for revert:
The failures remained on most platforms, like:
http://build.chromium.org/p/chromium.linux/builders/Linux%20GN/builds/29187

Assuming that this roll (which didn't contain anything anyways) is innocent.

Original issue's description:
> Revert of Update V8 to version 4.5.70. (patchset #1 id:1 of https://codereview.chromium.org/1199673002/)
>
> Reason for revert:
> Speculative revert for net_unittests failures.
>
> Original issue's description:
> > Update V8 to version 4.5.70.
> >
> > Summary of changes available at:
> > https://chromium.googlesource.com/v8/v8/+log/c6662ef8..b21c1412
> >
> > Please follow these instructions for assigning/CC'ing issues:
> > https://code.google.com/p/v8-wiki/wiki/TriagingIssues
> >
> > TBR=hablich@chromium.org,machenbach@chromium.org,yangguo@chromium.org,vogelheim@chromium.org
> >
> > Committed: https://crrev.com/7a7a8ece45d706a4603957fbc6fbd51b92d3d07a
> > Cr-Commit-Position: refs/heads/master@{#335449}
>
> TBR=hablich@chromium.org,vogelheim@chromium.org,yangguo@chromium.org,v8-autoroll@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
>
> Committed: https://crrev.com/da4d1158d13ad78a318ec27a52da356b5e725b5b
> Cr-Commit-Position: refs/heads/master@{#335453}

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

Review URL: https://codereview.chromium.org/1195253002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#335457}

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