Using 64-bit timestamp in webrtc/p2p

webrtc/p2p/stunprober/stunprober.h

Index: webrtc/p2p/stunprober/stunprober.h
diff --git a/webrtc/p2p/stunprober/stunprober.h b/webrtc/p2p/stunprober/stunprober.h
index b725cbef0a66a3e2e1731c610555964412d148fa..44999a201ededb506becbb58f17d72e07046469c 100644
--- a/webrtc/p2p/stunprober/stunprober.h
+++ b/webrtc/p2p/stunprober/stunprober.h
@@ -184,7 +184,7 @@ class StunProber : public sigslot::has_slots<> {
            requests_per_ip_;
   }
 
-  bool should_send_next_request(uint32_t now);
+  bool should_send_next_request(int64_t now);
   int get_wake_up_interval_ms();
 
   bool SendNextRequest();
@@ -201,7 +201,7 @@ class StunProber : public sigslot::has_slots<> {
   Requester* current_requester_ = nullptr;
 
   // The time when the next request should go out.
-  uint64_t next_request_time_ms_ = 0;
+  int64_t next_request_time_ms_ = 0;
 
   // Total requests sent so far.
   uint32_t num_request_sent_ = 0;