QUIC minor clean up to keep in sync with internal sources.

net/quic/quic_sustained_bandwidth_recorder.h

Index: net/quic/quic_sustained_bandwidth_recorder.h
diff --git a/net/quic/quic_sustained_bandwidth_recorder.h b/net/quic/quic_sustained_bandwidth_recorder.h
index aa5a4c916f510ea5fcf92e656ae2cee3c8414a11..11685d2817e417c81604e9390ccf9767053b48f6 100644
--- a/net/quic/quic_sustained_bandwidth_recorder.h
+++ b/net/quic/quic_sustained_bandwidth_recorder.h
@@ -48,7 +48,7 @@ class NET_EXPORT_PRIVATE QuicSustainedBandwidthRecorder {
     return max_bandwidth_estimate_;
   }
 
-  int32 MaxBandwidthTimestamp() const {
+  int64 MaxBandwidthTimestamp() const {
     DCHECK(has_estimate_);
     return max_bandwidth_timestamp_;
   }
@@ -79,7 +79,7 @@ class NET_EXPORT_PRIVATE QuicSustainedBandwidthRecorder {
   QuicBandwidth max_bandwidth_estimate_;
 
   // Timestamp indicating when the max_bandwidth_estimate_ was seen.
-  int32 max_bandwidth_timestamp_;
+  int64 max_bandwidth_timestamp_;
 
   // Timestamp marking the beginning of the latest recording period.
   QuicTime start_time_;