Revert of Update V8 to version 3.29.82 (based on bleeding_edge revision...

Revert of Update V8 to version 3.29.82 (based on bleeding_edge revision r24129). (patchset #1 id:1 of https://codereview.chromium.org/596703003/)

Reason for revert:
Unfortunately this causes layout test failures on ia32 systems. It makes:

http/tests/serviceworker/request.html

time out.

http://test-results.appspot.com/dashboards/flakiness_dashboard.html#master=ChromiumWebkit&tests=http/tests/serviceworker/request.html

Original issue's description:
> Update V8 to version 3.29.82 (based on bleeding_edge revision r24129).
>
> TBR=machenbach@chromium.org
>
> Committed: https://crrev.com/7e6bdb0cf9ef794af7ef2c76a83337d95abd4ac0
> Cr-Commit-Position: refs/heads/master@{#296166}

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

Review URL: https://codereview.chromium.org/594043003

Cr-Commit-Position: refs/heads/master@{#296169}

DEPS

@@ -40,7 +40,7 @@ vars = {
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.
   'v8_branch': 'trunk',
-  'v8_revision': 'a2c0c1516848536a514b3178d2c040b7df0ceb5b', # from svn revision 24136
+  'v8_revision': '703303d791f48729b927e5655ee066a3496a734d', # from svn revision 24107
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling WebRTC
   # and V8 without interference from each other.