Bug 1014611 - [v2.0] Fix intermittent test_receive_active_sync_email.py
Bug 1015013 - JSDoc 3 parse error getter/setter with the same name in strict mode
Merge pull request #19577 from gasolin/issue-1015013

Issue 1015013  JSDoc 3 getter/setter parse error in strict mode, r=yurenju
Merge pull request #19551 from chirarobert/wait_email_frame

Bug 1014611 - [v2.0] Fix intermittent test_receive_active_sync_email.py
Bug 1014501 - [WebComponents] @import polyfill