Remove heartbeat timestamp (#1449)

Author: zlydh

Firebase/Messaging/FIRMessaging.m

@@ -724,7 +724,7 @@ - (void)unsubscribeFromTopic:(NSString *)topic {
 
 - (void)unsubscribeFromTopic:(NSString *)topic
                   completion:(nullable FIRMessagingTopicOperationCompletion)completion {
- if ([FIRMessagingPubSub hasTopicsPrefix:topic]) {
+  if ([FIRMessagingPubSub hasTopicsPrefix:topic]) {
     FIRMessagingLoggerWarn(kFIRMessagingMessageCodeTopicFormatIsDeprecated,
                            @"Format '%@' is deprecated. Only '%@' should be used in "
                            @"unsubscribeFromTopic.",

Firebase/Messaging/FIRMessagingConnection.h

@@ -67,7 +67,6 @@ typedef NS_ENUM(NSUInteger, FIRMessagingConnectionCloseReason) {
  */
 @interface FIRMessagingConnection : NSObject
 
-@property(nonatomic, readwrite, assign) int64_t lastHeartbeatPingTimestamp;
 @property(nonatomic, readonly, assign) FIRMessagingConnectionState state;
 @property(nonatomic, readonly, copy) NSString *host;
 @property(nonatomic, readonly, assign) NSUInteger port;

Firebase/Messaging/FIRMessagingConnection.m

@@ -460,9 +460,6 @@ - (void)didReceiveHeartbeatPing:(GtalkHeartbeatPing *)heartbeatPing {
 }
 
 - (void)didReceiveHeartbeatAck:(GtalkHeartbeatAck *)heartbeatAck {
-#if FIRMessaging_PROBER
-  self.lastHeartbeatPingTimestamp = FIRMessagingCurrentTimestampInSeconds();
-#endif
 }
 
 - (void)didReceiveDataMessageStanza:(GtalkDataMessageStanza *)dataMessageStanza {

Firebase/Messaging/FIRMessagingSecureSocket.m

@@ -129,10 +129,6 @@ - (void)connectToHost:(NSString *)host
 
   BOOL isVOIPSocket = NO;
 
-#if FIRMessaging_PROBER
-  isVOIPSocket = YES;
-#endif
-
   [self openStream:self.outStream isVOIPStream:isVOIPSocket];
   [self openStream:self.inStream isVOIPStream:isVOIPSocket];
 }