update changelog for messaging and instanceID (#5368)

Author: charlotteliang

Firebase/InstanceID/CHANGELOG.md

@@ -1,3 +1,6 @@
+# 2020-04 -- 4.3.4
+- [changed] Internal cleanup and remove repetitive local notification. (#5339)
+
 # 2020-03 -- 4.3.3
 - [fixed] Fixed provisioning profile location for catalyst. (#5048)
 - [fixed] Fixed crash when passing a nil handler to deleteToken request. (#5247)

Firebase/Messaging/CHANGELOG.md

@@ -1,3 +1,6 @@
+# 2020-04 -- v4.3.1
+- [fixed] Fixed an issue that when a token is deleted, the token refresh notificaiton and delegate is not triggered. (#5338)
+
 # 2020-02 -- v4.3.0
 - [changed] Deprecated FCM direct channel messaging via `shouldEstablishDirectChannel`. Instead, use APNs for downstream message delivery. Add `content_available` key to your payload if you want to continue use legacy APIs, but we strongly recommend HTTP v1 API as it provides full APNs support. The deprecated API will be removed in Firebase 7. (#4710)
 - [changed] Deprecated upstream messaging API. For realtime updates, use Cloud Firestore, Realtime Database, or other services. The deprecated API will be removed in Firebase 7. (#4710)

Firebase/Messaging/FIRMessaging.m

@@ -940,8 +940,7 @@ - (void)defaultInstanceIDTokenWasRefreshed:(NSNotification *)notification {
   // Retrieve the Instance ID default token, and should notify delegate and
   // trigger notification as long as the token is different from previous state.
   NSString *oldToken = self.defaultFcmToken;
-  NSString *token = [(NSString *)notification.object copy];
-  self.defaultFcmToken = [token copy];
+  self.defaultFcmToken = [(NSString *)notification.object copy];
   if ((self.defaultFcmToken.length && oldToken.length &&
        ![self.defaultFcmToken isEqualToString:oldToken]) ||
       self.defaultFcmToken.length != oldToken.length) {