Remove SpringSessionWebSessionStore#storeSession

Closes gh-1150

Author: vpavic

spring-session-core/src/main/java/org/springframework/session/web/server/session/SpringSessionWebSessionStore.java

@@ -87,12 +87,6 @@ public Mono<WebSession> updateLastAccessTime(WebSession session) {
 		return Mono.just(session);
 	}
 
-	public Mono<Void> storeSession(WebSession session) {
-		@SuppressWarnings("unchecked")
-		SpringSessionWebSession springWebSession = (SpringSessionWebSession) session;
-		return this.sessions.save(springWebSession.session);
-	}
-
 	@Override
 	public Mono<WebSession> retrieveSession(String sessionId) {
 		return this.sessions.findById(sessionId)

spring-session-core/src/test/java/org/springframework/session/web/server/session/SpringSessionWebSessionStoreTests.java

@@ -253,17 +253,6 @@ public void createSessionWhenGetAttributesAndEntrySetThenDelegatesToCreateSessio
 				.containsExactly(new AbstractMap.SimpleEntry<>(attrName, attrValue));
 	}
 
-	@Test
-	public void storeSessionWhenInvokedThenSessionSaved() {
-		given(this.sessionRepository.save(this.createSession)).willReturn(Mono.empty());
-		WebSession createdSession = this.webSessionStore.createWebSession()
-				.block();
-
-		this.webSessionStore.storeSession(createdSession).block();
-
-		verify(this.sessionRepository).save(this.createSession);
-	}
-
 	@Test
 	public void retrieveSessionThenStarted() {
 		String id = "id";