Delete unusued DefaultDriverSessions class

Author: shs96c

java/server/src/org/openqa/selenium/remote/server/BUCK

@@ -22,7 +22,6 @@ java_library(name = 'server',
     'CapabilitiesComparator.java',
     'DefaultDriverFactory.java',
     'DefaultDriverProvider.java',
-    'DefaultDriverSessions.java',
     'DefaultSession.java',
     'DriverFactory.java',
     'DriverProvider.java',

java/server/src/org/openqa/selenium/remote/server/DefaultDriverSessions.java

@@ -36,7 +36,6 @@
     DefaultSessionTest.class,
     DriverFactoryTest.class,
     WebDriverServletTest.class,
-    DriverSessionTest.class,
     NewSessionPayloadTest.class,
     NewSessionPipelineTest.class,
     PassthroughTest.class,