brave-browser: KeePassXC-Browser chrome extension doesn't work in Brave on MacOS

Description

KeePassXC-Browser chrome extension doesn’t work in Brave or Brave-dev on MacOS. I have confirmed the extension works in Chrome.

Steps to Reproduce

1. Install KeePassXC-Browser extension
2. Enable browser integration for brave in KeePassXC (creates Brave-Browser/NativeMessagingHosts/org.keepassxc.keepassxc_browser.json - I copied manually for Brave-Browser-Dev)
3. Try to connect to KeePassXC through the extension

Actual result:

Key exchange was not successful.

Expected result:

Reproduces how often:

Consistant

Brave version (brave://version info)

Version/Channel Information:

Brave	0.68.86 Chromium: 75.0.3770.100 (Official Build) dev(64-bit)
Revision	cd0b15c8b6a4e70c44e27f35c37a4029bad3e3b0-refs/branch-heads/3770@{#1033}
OS	Mac OS X

• Can you reproduce this issue with the current release? yes
• Can you reproduce this issue with the beta channel? didnt try
• Can you reproduce this issue with the dev channel? yes
• Can you reproduce this issue with the nightly channel? didnt try

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? n/a
• Does the issue resolve itself when disabling Brave Rewards? n/a
• Is the issue reproducible on the latest version of Chrome? No, extension works as expected on latest Chrome

Miscellaneous Information:

See related report on keepassxc-browser github: https://github.com/keepassxreboot/keepassxc-browser/issues/541

debug info:

Connecting to native messaging host org.keepassxc.keepassxc_browser keepass.js:969 Failed to connect: Specified native messaging host not found. keepass.js:1192 Objectmessage: (...)get message: ƒ ()arguments: (...)caller: (...)length: 0name: ""__proto__: ƒ ()apply: ƒ apply()arguments: (...)bind: ƒ bind()call: ƒ call()caller: (...)constructor: ƒ Function()length: 0name: ""toString: ƒ toString()Symbol(Symbol.hasInstance): ƒ [Symbol.hasInstance]()get arguments: ƒ ()set arguments: ƒ ()get caller: ƒ ()set caller: ƒ ()__proto__: Object[[FunctionLocation]]: <unknown>[[Scopes]]: Scopes[0]No properties[[Scopes]]: Scopes[0]No properties__proto__: Object browser-polyfill.min.js:1 Returning a Promise is the preferred way to send a reply from an onMessage/onMessageExternal listener, as the sendResponse will be removed from the specs (See https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/runtime/onMessage) Error at B (chrome-extension://oboonakemofpalcgghocfoadofidjkkk/browser-polyfill.min.js:1:8152) at chrome-extension://oboonakemofpalcgghocfoadofidjkkk/background/event.js:108:9 B @ browser-polyfill.min.js:1 keepass.js:1078 Error 5: Cannot connect to KeePassXC. Check that browser integration is enabled in KeePassXC settings. keepass.js:993 Connecting to native messaging host org.keepassxc.keepassxc_browser keepass.js:969 Failed to connect: Specified native messaging host not found. keepass.js:1192 {}message: (...)get message: ƒ ()arguments: (...)caller: (...)length: 0name: ""__proto__: ƒ ()apply: ƒ apply()arguments: (...)bind: ƒ bind()call: ƒ call()caller: (...)constructor: ƒ Function()length: 0name: ""toString: ƒ toString()Symbol(Symbol.hasInstance): ƒ [Symbol.hasInstance]()get arguments: ƒ ()set arguments: ƒ ()get caller: ƒ ()set caller: ƒ ()__proto__: Object[[FunctionLocation]]: <unknown>[[Scopes]]: Scopes[0][[Scopes]]: Scopes[0]No properties__proto__: constructor: ƒ ()__proto__: Object keepass.js:1078 Error 9: Key exchange was not successful.