Revert of Revert of Update V8 to version 3.30.29 (based on...

Revert of Revert of Update V8 to version 3.30.29 (based on e634bdb290cb3761b9335d1bf7ec016fb3ebdbd5). (patchset #1 id:1 of https://codereview.chromium.org/686683005/)

Reason for revert:
Undo the revert, it wasn't the cause of the test failures.

Original issue's description:
> Revert of Update V8 to version 3.30.29 (based on e634bdb290cb3761b9335d1bf7ec016fb3ebdbd5). (patchset #1 id:1 of https://codereview.chromium.org/696283002/)
>
> Reason for revert:
> Common CL assumed to be causing Android Tests to fail:
>
> https://build.chromium.org/p/chromium.linux/builders/Android%20Tests/builds/16593
> and
> http://build.chromium.org/p/chromium.linux/builders/Android%20Tests%20%28dbg%29/builds/23875
>
> Original issue's description:
> > Update V8 to version 3.30.29 (based on e634bdb290cb3761b9335d1bf7ec016fb3ebdbd5).
> >
> > TBR=machenbach@chromium.org
> >
> > Committed: https://crrev.com/382af4619960b659a5ac7952dcc04e20ebaf4fe4
> > Cr-Commit-Position: refs/heads/master@{#302437}
>
> TBR=machenbach@chromium.org,v8-autoroll@chromium.org
> NOTREECHECKS=true
> NOTRY=true
>
> Committed: https://crrev.com/56957b6e401489d556fe87e5ca77b1e36170314f
> Cr-Commit-Position: refs/heads/master@{#302458}

TBR=machenbach@chromium.org,v8-autoroll@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/680393004

Cr-Commit-Position: refs/heads/master@{#302460}

DEPS

@@ -49,7 +49,7 @@ vars = {
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.
   'v8_branch': 'trunk',
-  'v8_revision': '8955e55db30b31cae138a39218f4086c7774c32a', # from svn revision 25059
+  'v8_revision': '17c668531c119125de3871a120e16b2a9bcaa567', # from svn revision 25075
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling WebRTC
   # and V8 without interference from each other.