Revert of Change V8 to branch 4.3 for M43

Revert of Change V8 to branch 4.3 for M43 (patchset #1 id:1 of https://codereview.chromium.org/1058943003/)

Reason for revert:
Painted entire blink tree red because of broken:
http/tests/security/window-named-proto.html
http/tests/security/xss-exception.html

See:
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7/builds/28188
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showLargeExpectations=true&tests=window-named-proto.html%2Chttp%2Ftests%2Fsecurity%2Fxss-exception.html

Original issue's description:
> Change V8 to branch 4.3 for M43
>
> This is a reland of the previous roll (crrev.com/1052993002) which got
> reverted due to an errant Blink change that depended on a newer version
> of the V8 API. That Blink change has since been reverted.
>
> R=hablich@chromium.org, machenbach@chromium.org
> TBR=hablich@chromium.org, machenbach@chromium.org, vogelheim@chromium.org
>
> Committed: https://chromium.googlesource.com/chromium/src/+/81d4867666467192685ae572de885796fe79c39a

TBR=hablich@chromium.org,machenbach@chromium.org,vogelheim@chromium.org,adamk@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/2760cace1648b215559e0b915d284f7b2345e492
Cr-Commit-Position: refs/heads/master@{#323650}

[alph, 2015-04-03 07:04:43]

Created Revert of Change V8 to branch 4.3 for M43

[commit-bot: I haz the power, 2015-04-03 07:05:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1059633003/1

[commit-bot: I haz the power, 2015-04-03 07:08:33]

Committed patchset #1 (id:1)

[Jakob Kummerow, 2015-04-03 11:27:26]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1060543003/ by jkummerow@chromium.org.

The reason for reverting is: The test expectation change
https://codereview.chromium.org/1050993005 needs to be reverted instead..

[commit-bot: I haz the power, 2015-04-03 20:33:30]

Patchset 1 (id:??) landed as
https://crrev.com/2760cace1648b215559e0b915d284f7b2345e492
Cr-Commit-Position: refs/heads/master@{#323650}