Merge pull request #21508 from millermedeiros/1002904-shared-icon-font

Bug 1002904 - calendar cold launch regression 100ms hamachi Apr23-Apr25 r=gaye
Revert "Merge pull request #21704 from Cwiiis/bug1038185-close-utility-tray-transition"

This reverts commit ba22e5fe47ed6b976363dffdc481575b868c407b.
Merge pull request #21856 from Cwiiis/bug1038185-close-utility-tray-transition

Bug 1038185 - Fix transition when closing utility tray. r=etienne