Chrome Version : 69.0.3474.0 (Official Build)  07ea11a69a583156cf0601a4a2f6253b84689574-refs/branch-heads/3474@{#1} 32/64 bit
OS : Windows (7, 8, 8.1, 10), Mac(10.12.6, 10.13.1, 10.13.5, 10.13.6)

What steps will reproduce the problem?
1. Launch chrome, open devtools on NTP, go to 'Memory' tab and take a 'Heap snapshot'.
2. Change drop down option to 'Containment' and expand 'Object' column such that recorded data is completely visible.
3. Observe the square symbol present at the end of each entry.

Actual Result : Unwanted square symbols are observed in 'Object' column of 'Heap snapshot' recording. 

Expected Result : Square symbols should not be seen in 'Object' column of 'Heap snapshot' recording. 

This is a regression issue broken in ‘M-69’ and below is the bisect info :
Good Build : 69.0.3469.3 (Revision : 569383)
Bad Build : 69.0.3472.0 (Revision : 569948)

You are probably looking for a change made after 569469 (known good), but no later than 569470 (first known bad).

Change Log URL :
https://chromium.googlesource.com/chromium/src/+log/d6cde02c31ae280a9406cd833bf8807014da29fd..14fa09fdfc00f3222a1e5574b2dd8821a2a90f7b

Suspect : https://chromium.googlesource.com/chromium/src/+/14fa09fdfc00f3222a1e5574b2dd8821a2a90f7b

Alexei@ : 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 : This issue is not observed in Linux(14.04 LTS) OS.

Thank you..!
 

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	Expected_Result.mp4 899 KB View Download

Deleted: Actual_Result.mp4 1.3 MB

	Actual_Result.mp4 1.3 MB View Download