Bug 1079692: update video thumbnail title asynchonously so we don't block when the user rotates the phone

fix spelling error in method name

update test busted by spelling correction
Merge pull request #26047 from davidflanagan/bug1079692

Bug 1079692: update video thumbnail title asynchonously so we don't block when user rotates phone r=johnhu
Merge remote-tracking branch 'upstream/master' into ImageCompare