I'm talking about this line: https://cs.chromium.org/chromium/src/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp?l=434

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/11539c86d2827abf795281446643991e6705790a

commit 11539c86d2827abf795281446643991e6705790a
Author: avayvod <avayvod@chromium.org>
Date: Mon May 08 18:54:33 2017

[Media, Controls] Cleanup resize observer before dereferencing.

BUG= 716506 
TEST=existing tests

Review-Url: https://codereview.chromium.org/2863713002
Cr-Commit-Position: refs/heads/master@{#470066}

[modify] https://crrev.com/11539c86d2827abf795281446643991e6705790a/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp

Your change meets the bar and is auto-approved for M59. Please go ahead and merge the CL to branch 3071 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), gkihumba@(ChromeOS), Abdul Syed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2a8571682829971095890c2c5269884ddc2d29cc

commit 2a8571682829971095890c2c5269884ddc2d29cc
Author: Anton Vayvod <avayvod@google.com>
Date: Tue May 09 19:43:42 2017

[Media, Controls] Cleanup resize observer before dereferencing.

BUG= 716506 
TEST=existing tests

Review-Url: https://codereview.chromium.org/2863713002
Cr-Commit-Position: refs/heads/master@{#470066}
(cherry picked from commit 11539c86d2827abf795281446643991e6705790a)

Review-Url: https://codereview.chromium.org/2865373002 .
Cr-Commit-Position: refs/branch-heads/3071@{#486}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}

[modify] https://crrev.com/2a8571682829971095890c2c5269884ddc2d29cc/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp