Chrome Version: 71.0.3572.0 (Official Build) Revision	2747bd652db387103b1b91a59dfe0d66c03b9902-refs/branch-heads/3572@{#1} (32/64-bit)
OS: Windows(7,8,8.1,10), Mac(10.12.6, 10.13.1, 10.13.6, 10.14.1) and Linux(14.04 LTs).

What steps will reproduce the problem?
1. Launch Chrome, open DevTools and dock it to bottom.
2. Go to 'Sources' section and add at-least two expressions under 'Watch' section.
3. Now again click on '+' (Add expression) icon and observe.

Actual: Unnecessary vertical scroll-bar appears under Watch section and it is not working also.
Expected: Vertical scroll-bar should not appear.

This is a regression issue, broken in M-69 series, below is manual regression range:

Good build: 69.0.3487.0 (Revision: 573575)
Bad build: 69.0.3488.0 (Revision: 574034)

Using the 'per-revision' script providing the bisect result:

You are probably looking for a change made after 573727 (known good), but no later than 573728 (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/0b2913f77458868e75f299eaff1b84767bacb661..9cf21e0c6801d09032574ea225958fd1a34ad5c9

Suspecting: https://chromium.googlesource.com/chromium/src/+/9cf21e0c6801d09032574ea225958fd1a34ad5c9

@alph: 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 also reproducible on Stable #69.0.3497.100, Beat #70.0.3538.45 and Dev #71.0.3569.0

Kindly review the attached screen-cast & screenshot for reference.

Thank you.

 

Deleted: Actual behavior.mp4 1.5 MB

	Actual behavior.mp4 1.5 MB View Download

Deleted: Expected behavior.mp4 1.3 MB

	Expected behavior.mp4 1.3 MB View Download