Remove only one Lambda Exp for JAVA 7

Remove a Lambda Exp and replace ConcurrentHashMap#computeIfAbsent() with
containsKey() and put() so that this app can be built using JAVA 7.

Test: Build

Signed-off-by: Taesu Lee <taesu82.lee@samsung.com>
Change-Id: I7ff8a3b5fc4673dfe05c5ecc9418d377f3ed4f2e
1 file changed