Chrome version : 66.0.3359.22 Revision 37c99647fccce6a8929b1ddebbcdfbe6148dea43-refs/branch-heads/3359@{#126}(32/64 bit)
OS: Windows(7,8,8.1,10), Linux(14.04 LTS)

What steps will reproduce the problem?
(1) Launch chrome and press 'Ctrl + T' to open new tabs
(2) Open approximately 50 to 60 tabs and then click on second tab to close it
(3) Now hover mouse on close button of next tab and observe

Actual: Close button 'x' on tab appears chopped from LHS
Expected: Close button 'x' on tab should be seen properly

Good Build:66.0.3347.0 (Revision : 536861)
Bad Build:66.0.3348.0  (Revision : 536934)

Unable to narrow down the range using per-revision bisect script hence proving suspect from narrow bisect.

Narrow Bisect:
https://chromium.googlesource.com/chromium/src/+log/a193b7d8016a25799f2a821f229caa2e28f0d5be..2853b263c3d5f4c8bfc9b654760937dff3672dce?pretty=fuller&n=10000

Suspect: r536862?

@sangwoo108: Could you please look into the issue, pardon me if it has nothing to do with your changes and if possible please assign it to concern owner.

Note: 1. Above issue is also seen on latest Canary M-67 (# 67.0.3366.0)
      2. Above issue is not seen on Mac(10.12.6,10.13.1,10.13.4)OS
 

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	Actual_video.mp4 803 KB View Download

Deleted: Expected_video.mp4 934 KB

	Expected_video.mp4 934 KB View Download