A Pokemon's Hidden Ability, if different from their Gen 5 one in Gen 6, will have their Gen 6 ability once transferred into Pokemon X/Y. This means something like Quick Feet Scolipede will end up being Speed Boost Scolipede if transfered.
In Generation V, Scolipede and its evolutionary relatives have Quick Feet instead of Speed Boost as their Hidden Ability. If a Scolipede with Quick Feet is transferred from Generation V to Generation VI using the Poké Transporter, its Ability will become Speed Boost.
In addition to this, your Chandelure probably won't transfer anyway. And if it did, yes it would have Iniltrator
Why wouldn't it transfer?
Shadow tag was NEVER RELEASED on the Chandelure line.
In Generation V games, Litwick, Lampent, and Chandelure have Shadow Tag as their Hidden Ability, but they cannot be obtained by any legitimate means. Their Hidden Ability is replaced with Infiltrator in Generation VI.