Chrome Version: 67.0.3389.0 (Official Build)Revision 58f84d059486796cc3652797eab5eab997720cad-refs/heads/master@{#548273} 32/64-bit.
OS: Win(7,8,8.1,10), Mac(10.12.6, 10.13.1, 10.13.4) and Linux (14.04 LTS).

What steps will reproduce the problem?
1. Launch Chrome, open DevTools and dock it to bottom.
2. Press "Ctrl+F" key from keyboard to open 'Find-in-box' under Element section.
3. Completely resize the DevTools window from top to bottom and observe the Find-in-box.

Actual: Lower border of 'Find-in' textbox and 'Cancel' button are seems to be chopped. 
Expected: Lower border of 'Find-in' textbox and 'Cancel' should seen properly.

This is a regression issue broken in M-61 series, below is manual regression range.

Good build: 61.0.3121.0 (Revision: 477035)
Bad build: 61.0.3123.0 (Revision: 477506)

You are probably looking for a change made after 477193 (known good), but no later than 477194 (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/6fd962cb3e87ed2c1738f63b6a730f63badf7bf8..067ae0c565d431228fbcada9823b47d371f54b7d

Suspecting: https://chromium.googlesource.com/chromium/src/+/067ae0c565d431228fbcada9823b47d371f54b7d

@luoe: 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: This issue is also reproducible on M-65 Stable (build # 65.0.3325.181) and M-66 Beta (build # 66.0.3359.81) and M-67 Dev (build # 67.0.3386.1)

Kindly review the attached screen-cast for reference.

Thank you.
 

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	Actual behavior.mov 4.6 MB View Download

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	Expected behavior.mov 2.8 MB View Download