Use int64_t more consistently for times, in particular for RTT values.

Existing code was inconsistent about whether to use uint16_t, int, unsigned int,
or uint32_t, and sometimes silently truncated one to another, or truncated
int64_t.  Because most core time-handling functions use int64_t, being
consistent about using int64_t unless otherwise necessary minimizes the number
of explicit or implicit casts.

BUG=chromium:81439
TEST=none
R=henrik.lundin@webrtc.org, holmer@google.com, tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/31349004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@8045 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/video_coding/main/source/receiver.h b/webrtc/modules/video_coding/main/source/receiver.h
index 068715f..f531ac8 100644
--- a/webrtc/modules/video_coding/main/source/receiver.h
+++ b/webrtc/modules/video_coding/main/source/receiver.h
@@ -44,7 +44,7 @@
 
   void Reset();
   int32_t Initialize();
-  void UpdateRtt(uint32_t rtt);
+  void UpdateRtt(int64_t rtt);
   int32_t InsertPacket(const VCMPacket& packet,
                        uint16_t frame_width,
                        uint16_t frame_height);
@@ -57,8 +57,8 @@
 
   // NACK.
   void SetNackMode(VCMNackMode nackMode,
-                   int low_rtt_nack_threshold_ms,
-                   int high_rtt_nack_threshold_ms);
+                   int64_t low_rtt_nack_threshold_ms,
+                   int64_t high_rtt_nack_threshold_ms);
   void SetNackSettings(size_t max_nack_list_size,
                        int max_packet_age_to_nack,
                        int max_incomplete_time_ms);