Version: 72.0.3608.0 (Official Build) Revision 13a876533812d5e196bca2b1c60634dc14a79700-refs/branch-heads/3608@{#1}(64-bit)
OS: Mac OS X(10.13.1,10.14.1,10.13.6)

What steps will reproduce the problem?
1. Launch chrome,navigate to NTP and click on 'Customize and control Google Chrome' iron icon to open wrench menu.
2. Now hover mouse over '+' icon of zoom option and press space bar key continuously,observe
 
Actual: Unable to zoom in and zoom out page using space bar key from wrench menu zoom option
Expected: Should be able to zoom in and zoom out using space bar key from wrench menu zoom option

This is regression issue, broken in ‘M 70’ and below is the bisect info :
Good build: 70.0.3535.0 (Revision: 586475)
Bad build:  70.0.3536.0 (Revision: 587136)
 
You are probably looking for a change made after 586715 (known good), but no later than 586716 (first known bad).

CHANGELOG URL:

The script might not always return single CL as suspect as some perf builds might get missing due to failure.
  
https://chromium.googlesource.com/chromium/src/+log/af196b7d7821f1458f3f00683e443cb7171ff077..c3c431a27cb8043f057e4bfd167808230d0bb4d1

Suspect : https://chromium.googlesource.com/chromium/src/+/c3c431a27cb8043f057e4bfd167808230d0bb4d1

From the CL above, assigning the issue to the concern owner 

@ellyjones - Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Note : 
1. This issue is also reproducible on M-70 stable (build # 70.0.3538.102), M-71 Beta (build # 71.0.3578.44) and M-72 Dev (build # 72.0.3602.2)
2. Issue is not seen on Windows (7,8,8.1,10) and Linux (14.04 LTS) OS
 

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