Chrome Version: 67.0.3378.0 (Official Build) Revision 05e32b12a408b22f5fd5ecd036fbc541b8ffb8b2-refs/heads/master@{#544931} 32/64-bit.
OS: Mac(10.12.6,10.13.1,10.13.4).

What steps will reproduce the problem?
1. Launch Chrome and download any webpage from right click context menu.
2. Now observe the 'Show All' button at download shelf.

Actual: Download icon is missing from 'Show All' button.
Expected: Download icon should seen on 'Show All' button.

This is a regression issue, broken in M-67 series, below is manual regression range.

Good build: 67.0.3364.0
Bad build: 67.0.3365.0

Using the per-revision bisect providing the bisect results:

You are probably looking for a change made after 541362 (known good), but no later than 541363 (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/1cffa8f71564086c45cae117d9321ec52458c6be..405ee5e59e4e3a1f487a700d7e599f6570dfbede

Suspecting: https://chromium.googlesource.com/chromium/src/+/405ee5e59e4e3a1f487a700d7e599f6570dfbede

@sdy: 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 not observed on Windows(7,8,8.1,10) and Linux(14.04 LTS) OS, since the download icon on 'Show All' button at download shelf is only seen in Mac OS.

Kindly review the attached screen-cast for reference.

Thank you.
 

Deleted: Button_Screenshot.png 10.8 KB

	Button_Screenshot.png 10.8 KB View Download

Deleted: Actual behavior.mov 3.2 MB

	Actual behavior.mov 3.2 MB View Download

Deleted: Expected behavior.mov 2.4 MB

	Expected behavior.mov 2.4 MB View Download