Chrome Version: 71.0.3578.53 (Official Build) Revision	599fb72e740eab9d10609f1ed28a2ad669f82c1a-refs/branch-heads/3578@{#669} (32/64-bit)
OS: Windows (7,8,8.1,10), Mac(10.13.1, 10.13.6, 10.14.2) and Linux(14.04 LTS).

What steps will reproduce the problem?
1. Launch Chrome, open DevTools and go to 'Sources' section.
2. Add 7-8 expressions under 'Watch' section so that vertical scroll-bar appears.
3. Now click on 'Add expression (+)' icon to open expression text-box and observe.

Actual: Bottom border of expression text-box appears to be chopped and down arrow of vertical scroll-bar is not disabled.
Expected: Expression text-box should seen properly and down arrow of vertical scroll-bar should be disabled.

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 #70.0.3538.102, Beta #71.0.3578.44, Dev #72.0.3608.4 & Canary #72.0.3609.3

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

Thank you.
 

Deleted: Expression-text-box_Screenshot.png 25.2 KB

	Expression-text-box_Screenshot.png 25.2 KB View Download

Deleted: Actual behavior.mp4 2.0 MB

	Actual behavior.mp4 2.0 MB View Download

Deleted: Expected behavior.mp4 1.9 MB

	Expected behavior.mp4 1.9 MB View Download