Bug 987445 - [B2G][SMS]Delete button behavior intermittently unexpected when no conversations are selected r=arnau

This removes the 'vertical-align: middle' property for icon buttons.
Merge pull request #17722 from julienw/987445-v1.3-remove-vertical-align-middle-for-icon-buttons

Bug 987445 - [B2G][SMS]Delete button behavior intermittently unexpected ...
Bug 982540 - [Music] Recover the status to PLAYING after the player is resumed from the mozinterrupend event
Merge pull request #17808 from dominickuo/v1.3-bug-982540

Bug 982540 - [Music] Recover the status to PLAYING after the player is resumed from the mozinterrupend event, r=jimporter
Merge pull request #17474 from gitmai/bug-986473-CC-modify-parameters

Bug 986473 -Modify cost control parameters
r=salva
Merge branch 'v1.3' into v1.3t