Fixing file list in buck file

Author: barancev

java/client/src/org/openqa/selenium/BUCK

@@ -50,7 +50,6 @@ java_library(name = 'core',
     'WebElement.java',
     'internal/ElementScrollBehavior.java',
     'internal/HasIdentity.java',
-    'internal/Killable.java',
     'internal/Locatable.java',
     'internal/Lock.java',
     'internal/SocketLock.java',