Crashed when dragging enters into sidebar web panel

[simonhong]

Crashed when dragging enters into sidebar webpanel. Only happen on macOS.

Description

Steps to Reproduce

1. Enable sidebar feature via brave://flags and re-launch
2. Load brave.com in a new tab
3. Click sidebar's brave together panel
4. Dragging brave.com tab's site info (security icon in omnibox) into sidebar web panel

Actual result:

Crashed

Expected result:

Not crashed

Reproduces how often:

Brave version (brave://version info)

Version/Channel Information:

• Can you reproduce this issue with the current release? NO
• Can you reproduce this issue with the beta channel? NO
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

Miscellaneous Information:

[stephendonner]

Marking as QA/Blocked until we get Sidebar merged into the 1.25.x branch.

[LaurenWags]

cc @rebron to confirm, but I think sidebar is behind a flag - so I think we should be able to test this one.

[simonhong]

@LaurenWags Yes, sidebar is behind a flag and that flag is only available for nightly. it's not available for beta/stable yet.

[LaurenWags]

per discussion with @simonhong @rebron @stephendonner this can be tested on Nightly

[LaurenWags]

Verified passed with

Brave	1.26.21 Chromium: 91.0.4472.57 (Official Build) nightly (x86_64)
Revision	e3443317fa07f1e9997e4a9c738eddfefc3c0292-refs/branch-heads/4472_54@{#6}
OS	macOS Version 10.15.7 (Build 19H1030)

Verified STR from description. Confirmed no crash was observed.