Bug 1025552 - [Messages][Refactoring] Refactor attachment.js and specifically move rendering part to a separate module. r=julienw, schung
Merge pull request #20376 from azasypkin/bug-1012663-csp-compliance

Bug 1025552 - [Messages][Refactoring] Refactor attachment.js and specifically move rendering part to a separate module. r=julienw, schung