See https://codereview.chromium.org/2182763003/ (the failed revert) for more details.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/feb65014ca1410c71cc86e4f10c31d8c2edd8b59

commit feb65014ca1410c71cc86e4f10c31d8c2edd8b59
Author: benwells <benwells@chromium.org>
Date: Tue Jul 26 06:32:26 2016

Revert v8 roll as it caused DrMemory GYP errors.

TBR=machenbach
BUG= 631315 

Review-Url: https://codereview.chromium.org/2185473002
Cr-Commit-Position: refs/heads/master@{#407724}

[modify] https://crrev.com/feb65014ca1410c71cc86e4f10c31d8c2edd8b59/DEPS

Will revert CL on v8 side and reissue a cherry-picked roll.

This seems to have slipped through undetected as there is no gyp support anymore in the chromium CQ that would have exercised the erroneous parts.

Do the drmemory bots switch to GN soon? That would be desirable if failures there can cause roll reverts.

Yeah, gyp toolchains aren't exercised as much as they used to be. It would be good to switch over those bots but I'm not sure who is working on it.

CC dirk regarding comment 4.

Roll with the revert https://codereview.chromium.org/2180123002/

There isn't much GYP coverage left, but there is still a win GYP builder in the Chromium CQ (win8_chromium_gyp_rel), which succeeded on the roll.

However, most of the GYP builders do not run with the syntax check option, so they miss errors like this.

We're trying to stamp out the last win GYP builders this week; the DrMem builders will hopefully be flipped over today, and we'll hopefully try to flip the official builders again today or tomorrow (we've been blocked on a bug but hopefully that fix is rolling in now). 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/194ee6e28fc2f451e2de22380dee2b4ea09259e2

commit 194ee6e28fc2f451e2de22380dee2b4ea09259e2
Author: Will Harris <wfh@chromium.org>
Date: Wed Jul 27 01:58:43 2016

Merge 2808: Revert v8 roll as it caused DrMemory GYP errors.

TBR=machenbach
BUG= 631315 ,631310

Review-Url: https://codereview.chromium.org/2185473002
Cr-Commit-Position: refs/heads/master@{#407724}
(cherry picked from commit feb65014ca1410c71cc86e4f10c31d8c2edd8b59)

Review URL: https://codereview.chromium.org/2178353007 .

Cr-Commit-Position: refs/branch-heads/2808@{#2}
Cr-Branched-From: 96ce8347f39ce0eebd10de476afb08c0afb406c9-refs/heads/master@{#407658}

[modify] https://crrev.com/194ee6e28fc2f451e2de22380dee2b4ea09259e2/DEPS